BD-FIX

The Ultimate Guide to Server-to-Server Email Migration Using Imapsync

Shoaib January 01, 2026 Tech Tips

<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhbIuueNNNahXF9oex0z2rMBdj55yWOPb2q5E1oGQ2wExc-XISYvJAUu-pV2bdV0rgH1FOEU7_Zlle0y3e4ThmMWN3Z3FYv2HKbPMribe4saLHBE81E5uWn3FrMeTfOVtghBw8N_vQA2j10xjMpxpkY8HG7CgUESE_3aeK6JWLvo-lzeRm09oI-ldaq9EY/s2816/Gemini_Generated_Image_edm3ijedm3ijedm3.png" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1536" data-original-width="2816" height="352" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhbIuueNNNahXF9oex0z2rMBdj55yWOPb2q5E1oGQ2wExc-XISYvJAUu-pV2bdV0rgH1FOEU7_Zlle0y3e4ThmMWN3Z3FYv2HKbPMribe4saLHBE81E5uWn3FrMeTfOVtghBw8N_vQA2j10xjMpxpkY8HG7CgUESE_3aeK6JWLvo-lzeRm09oI-ldaq9EY/w640-h352/Gemini_Generated_Image_edm3ijedm3ijedm3.png" width="640" /></a></div><p style="color: #333333; font-family: Arial, sans-serif;">Migrating email accounts from one hosting server to another is often a nightmare for <a class="b-tooltip-container" data-preview="" href="https://www.google.com/search?ved=1t:260882&q=define+IT+administrators&bbid=8371891515989187603&bpid=3578947612971807267" target="_blank"><span class="b-tooltip" style="display: none;"><iframe src="/share-widget?w=poi&o=t&u=https%3A%2F%2Fwww.google.com%2Fsearch%3Fved%3D1t%3A260882%26q%3Ddefine%2BIT%2Badministrators%26bbid%3D8371891515989187603%26bpid%3D3578947612971807267"></iframe></span>IT administrators</a> and <a class="b-tooltip-container" data-preview="" href="https://www.google.com/search?ved=1t:260882&q=define+hosting+resellers&bbid=8371891515989187603&bpid=3578947612971807267" target="_blank"><span class="b-tooltip" style="display: none;"><iframe src="/share-widget?w=poi&o=t&u=https%3A%2F%2Fwww.google.com%2Fsearch%3Fved%3D1t%3A260882%26q%3Ddefine%2Bhosting%2Bresellers%26bbid%3D8371891515989187603%26bpid%3D3578947612971807267"></iframe></span>hosting resellers</a>. The traditional method involving <a class="b-tooltip-container" data-preview="" href="https://www.google.com/search?ved=1t:260882&q=Outlook+email+client&bbid=8371891515989187603&bpid=3578947612971807267" target="_blank"><span class="b-tooltip" style="display: none;"><iframe src="/share-widget?w=poi&o=t&u=https%3A%2F%2Fwww.google.com%2Fsearch%3Fved%3D1t%3A260882%26q%3DOutlook%2Bemail%2Bclient%26bbid%3D8371891515989187603%26bpid%3D3578947612971807267"></iframe></span>Outlook</a> (downloading emails to a local <a class="b-tooltip-container" data-preview="" href="https://www.google.com/search?ved=1t:260882&q=define+PST+file&bbid=8371891515989187603&bpid=3578947612971807267" target="_blank"><span class="b-tooltip" style="display: none;"><iframe src="/share-widget?w=poi&o=t&u=https%3A%2F%2Fwww.google.com%2Fsearch%3Fved%3D1t%3A260882%26q%3Ddefine%2BPST%2Bfile%26bbid%3D8371891515989187603%26bpid%3D3578947612971807267"></iframe></span>PST file</a> and re-uploading them) is slow, prone to errors, and consumes massive amounts of local disk space.</p><p style="color: #333333; font-family: Arial, sans-serif;">In this tutorial, I will show you how to migrate emails efficiently using <strong><a class="b-tooltip-container" data-preview="" href="https://www.google.com/search?ved=1t:260882&q=Imapsync&bbid=8371891515989187603&bpid=3578947612971807267" target="_blank"><span class="b-tooltip" style="display: none;"><iframe src="/share-widget?w=poi&o=t&u=https%3A%2F%2Fwww.google.com%2Fsearch%3Fved%3D1t%3A260882%26q%3DImapsync%26bbid%3D8371891515989187603%26bpid%3D3578947612971807267"></iframe></span>Imapsync</a></strong>. This tool transfers emails directly between servers using the <a class="b-tooltip-container" data-preview="" href="https://www.google.com/search?ved=1t:260882&q=define+IMAP+protocol&bbid=8371891515989187603&bpid=3578947612971807267" target="_blank"><span class="b-tooltip" style="display: none;"><iframe src="/share-widget?w=poi&o=t&u=https%3A%2F%2Fwww.google.com%2Fsearch%3Fved%3D1t%3A260882%26q%3Ddefine%2BIMAP%2Bprotocol%26bbid%3D8371891515989187603%26bpid%3D3578947612971807267"></iframe></span>IMAP protocol</a>, preserving your folder structure and saving your local storage.</p><h2 style="border-bottom: 2px solid rgb(236, 240, 241); color: #2c3e50; font-family: Arial, sans-serif; margin-top: 30px; padding-bottom: 10px;">What is Imapsync?</h2><p style="color: #333333; font-family: Arial, sans-serif;"><strong>Imapsync</strong> is a command-line tool for <a class="b-tooltip-container" data-preview="" href="https://www.google.com/search?ved=1t:260882&q=Linux+operating+system&bbid=8371891515989187603&bpid=3578947612971807267" target="_blank"><span class="b-tooltip" style="display: none;"><iframe src="/share-widget?w=poi&o=t&u=https%3A%2F%2Fwww.google.com%2Fsearch%3Fved%3D1t%3A260882%26q%3DLinux%2Boperating%2Bsystem%26bbid%3D8371891515989187603%26bpid%3D3578947612971807267"></iframe></span>Linux</a> that synchronizes mailboxes between two IMAP servers. It is "<a class="b-tooltip-container" data-preview="" href="https://www.google.com/search?ved=1t:260882&q=define+idempotent&bbid=8371891515989187603&bpid=3578947612971807267" target="_blank"><span class="b-tooltip" style="display: none;"><iframe src="/share-widget?w=poi&o=t&u=https%3A%2F%2Fwww.google.com%2Fsearch%3Fved%3D1t%3A260882%26q%3Ddefine%2Bidempotent%26bbid%3D8371891515989187603%26bpid%3D3578947612971807267"></iframe></span>idempotent</a>," meaning you can run it multiple times without creating duplicate emails—it simply resumes where it left off.</p><h2 style="border-bottom: 2px solid rgb(236, 240, 241); color: #2c3e50; font-family: Arial, sans-serif; margin-top: 30px; padding-bottom: 10px;">Prerequisites</h2><ul style="color: #333333; font-family: Arial, sans-serif; margin-bottom: 20px;"><li style="margin-bottom: 10px;">A computer with a Linux terminal (If you are on Windows, use <strong><a class="b-tooltip-container" data-preview="" href="https://www.google.com/search?ved=1t:260882&q=WSL+Windows+Subsystem+for+Linux&bbid=8371891515989187603&bpid=3578947612971807267" target="_blank"><span class="b-tooltip" style="display: none;"><iframe src="/share-widget?w=poi&o=t&u=https%3A%2F%2Fwww.google.com%2Fsearch%3Fved%3D1t%3A260882%26q%3DWSL%2BWindows%2BSubsystem%2Bfor%2BLinux%26bbid%3D8371891515989187603%26bpid%3D3578947612971807267"></iframe></span>WSL</a></strong> - <a class="b-tooltip-container" data-preview="" href="https://www.google.com/search?ved=1t:260882&q=Windows+Subsystem+for+Linux&bbid=8371891515989187603&bpid=3578947612971807267" target="_blank"><span class="b-tooltip" style="display: none;"><iframe src="/share-widget?w=poi&o=t&u=https%3A%2F%2Fwww.google.com%2Fsearch%3Fved%3D1t%3A260882%26q%3DWindows%2BSubsystem%2Bfor%2BLinux%26bbid%3D8371891515989187603%26bpid%3D3578947612971807267"></iframe></span>Windows Subsystem for Linux</a>).</li><li style="margin-bottom: 10px;">The hostname of the old server (e.g., <code style="background-color: #f9f2f2; border-radius: 4px; color: #c0392b; font-weight: bold; padding: 2px 5px;">old.server.com</code>).</li><li style="margin-bottom: 10px;">The hostname of the new server (e.g., <code style="background-color: #f9f2f2; border-radius: 4px; color: #c0392b; font-weight: bold; padding: 2px 5px;">new.server.com</code>).</li><li style="margin-bottom: 10px;">Usernames and passwords for the email accounts on both servers.</li></ul><h2 style="border-bottom: 2px solid rgb(236, 240, 241); color: #2c3e50; font-family: Arial, sans-serif; margin-top: 30px; padding-bottom: 10px;">Step 1: The Password File Trick (Crucial!)</h2><p style="color: #333333; font-family: Arial, sans-serif;">Many email passwords contain special characters like <code style="background-color: #f9f2f2; border-radius: 4px; color: #c0392b; font-weight: bold; padding: 2px 5px;">@</code>, <code style="background-color: #f9f2f2; border-radius: 4px; color: #c0392b; font-weight: bold; padding: 2px 5px;">$</code>, or <code style="background-color: #f9f2f2; border-radius: 4px; color: #c0392b; font-weight: bold; padding: 2px 5px;">!</code>. If you type these directly into the command line, Linux might misinterpret them, causing errors. The safest way is to save the password in a text file.</p><p style="color: #333333; font-family: Arial, sans-serif;">Open your terminal and create a password file (assuming all accounts use the same migration password):</p><pre style="background-color: #f4f4f4; border-color: rgb(221, 221, 221) rgb(221, 221, 221) rgb(221, 221, 221) rgb(46, 204, 113); border-image: initial; border-style: solid; border-width: 1px 1px 1px 5px; color: #333333; font-family: "Courier New", Courier, monospace; overflow-x: auto; padding: 15px;">echo 'YourSecurePassword123' > pass.txt</pre><p style="color: #333333; font-family: Arial, sans-serif;"><em>This creates a file named <code style="background-color: #f9f2f2; border-radius: 4px; color: #c0392b; font-weight: bold; padding: 2px 5px;">pass.txt</code> containing your password.</em></p><h2 style="border-bottom: 2px solid rgb(236, 240, 241); color: #2c3e50; font-family: Arial, sans-serif; margin-top: 30px; padding-bottom: 10px;">Step 2: Migrating a Single Account</h2><p style="color: #333333; font-family: Arial, sans-serif;">To migrate a single email account, use the following command structure. Note that we are using <code style="background-color: #f9f2f2; border-radius: 4px; color: #c0392b; font-weight: bold; padding: 2px 5px;">--passfile</code> instead of typing the password directly.</p><pre style="background-color: #f4f4f4; border-color: rgb(221, 221, 221) rgb(221, 221, 221) rgb(221, 221, 221) rgb(46, 204, 113); border-image: initial; border-style: solid; border-width: 1px 1px 1px 5px; color: #333333; font-family: "Courier New", Courier, monospace; overflow-x: auto; padding: 15px;">./imapsync --host1 old.server.com --user1 info@old-domain.com --passfile1 pass.txt --ssl1 \
           --host2 new.server.com --user2 info@new-domain.com --passfile2 pass.txt --ssl2</pre><div class="note" style="background-color: #e8f8f5; border-left: 5px solid rgb(26, 188, 156); color: #333333; font-family: Arial, sans-serif; margin: 20px 0px; padding: 15px;"><strong>Tip:</strong> You can add the <code style="background-color: #f9f2f2; border-radius: 4px; color: #c0392b; font-weight: bold; padding: 2px 5px;">--dry</code> flag at the end of the command first. This performs a "simulation" to check if the credentials and connection are correct without actually moving any data.</div><h2 style="border-bottom: 2px solid rgb(236, 240, 241); color: #2c3e50; font-family: Arial, sans-serif; margin-top: 30px; padding-bottom: 10px;">Step 3: Batch Migration (Automating Multiple Accounts)</h2><p style="color: #333333; font-family: Arial, sans-serif;">If you have 10, 15, or 50 email accounts, typing the command one by one is tedious. Here is a <a class="b-tooltip-container" data-preview="" href="https://www.google.com/search?ved=1t:260882&q=Bash+script+definition&bbid=8371891515989187603&bpid=3578947612971807267" target="_blank"><span class="b-tooltip" style="display: none;"><iframe src="/share-widget?w=poi&o=t&u=https%3A%2F%2Fwww.google.com%2Fsearch%3Fved%3D1t%3A260882%26q%3DBash%2Bscript%2Bdefinition%26bbid%3D8371891515989187603%26bpid%3D3578947612971807267"></iframe></span>Bash script</a> I used to migrate 15 accounts automatically.</p><p style="color: #333333; font-family: Arial, sans-serif;">Create a file named <code style="background-color: #f9f2f2; border-radius: 4px; color: #c0392b; font-weight: bold; padding: 2px 5px;"><a class="b-tooltip-container" data-preview="" href="https://www.google.com/search?ved=1t:260882&q=migrate_all.sh+script+example&bbid=8371891515989187603&bpid=3578947612971807267" target="_blank"><span class="b-tooltip" style="display: none;"><iframe src="/share-widget?w=poi&o=t&u=https%3A%2F%2Fwww.google.com%2Fsearch%3Fved%3D1t%3A260882%26q%3Dmigrate_all.sh%2Bscript%2Bexample%26bbid%3D8371891515989187603%26bpid%3D3578947612971807267"></iframe></span>migrate_all.sh</a></code> using the command <code style="background-color: #f9f2f2; border-radius: 4px; color: #c0392b; font-weight: bold; padding: 2px 5px;"><a class="b-tooltip-container" data-preview="" href="https://www.google.com/search?ved=1t:260882&q=nano+text+editor&bbid=8371891515989187603&bpid=3578947612971807267" target="_blank"><span class="b-tooltip" style="display: none;"><iframe src="/share-widget?w=poi&o=t&u=https%3A%2F%2Fwww.google.com%2Fsearch%3Fved%3D1t%3A260882%26q%3Dnano%2Btext%2Beditor%26bbid%3D8371891515989187603%26bpid%3D3578947612971807267"></iframe></span>nano</a> migrate_all.sh</code> and paste the following code:</p><pre style="background-color: #f4f4f4; border-color: rgb(221, 221, 221) rgb(221, 221, 221) rgb(221, 221, 221) rgb(46, 204, 113); border-image: initial; border-style: solid; border-width: 1px 1px 1px 5px; color: #333333; font-family: "Courier New", Courier, monospace; overflow-x: auto; padding: 15px;">#!/bin/bash

# --- Configuration ---
HOST1="premium264.web-hosting.com" # Old Server
HOST2="premium909.web-hosting.com" # New Server
PASSFILE="pass.txt"
DOMAIN1="old-domain.com"
DOMAIN2="new-domain.com"

# --- List of Usernames ---
# Add your email usernames here (the part before the @)
declare -a users=(
    "admin"
    "info"
    "sales"
    "hr"
    "support"
    "ceo"
    # Add as many users as you need
)

# --- The Loop ---
for user in "${users[@]}"; do
    USER1="${user}@${DOMAIN1}"
    USER2="${user}@${DOMAIN2}"

echo "========================================="
    echo "Syncing: $USER1  --->  $USER2"
    echo "========================================="

./imapsync --host1 $HOST1 --user1 $USER1 --passfile1 $PASSFILE --ssl1 \
               --host2 $HOST2 --user2 $USER2 --passfile2 $PASSFILE --ssl2 --noauthmd5
    
    echo "Completed: $USER1"
    echo "Waiting 5 seconds..."
    sleep 5
done

echo "Batch Migration Completed!"</pre><p style="color: #333333; font-family: Arial, sans-serif;">Save the file and run it using: <code style="background-color: #f9f2f2; border-radius: 4px; color: #c0392b; font-weight: bold; padding: 2px 5px;">bash migrate_all.sh</code></p><h2 style="border-bottom: 2px solid rgb(236, 240, 241); color: #2c3e50; font-family: Arial, sans-serif; margin-top: 30px; padding-bottom: 10px;">Pro Tip: Migrating "Recent" Emails First</h2><p style="color: #333333; font-family: Arial, sans-serif;">If you have huge mailboxes (e.g., 10 years of data), migrating everything at once might take days. To let your clients start working immediately, you can migrate only the last 3 months (90 days) of emails first.</p><p style="color: #333333; font-family: Arial, sans-serif;">Simply add the <code style="background-color: #f9f2f2; border-radius: 4px; color: #c0392b; font-weight: bold; padding: 2px 5px;">--maxage 90</code> flag to your command:</p><pre style="background-color: #f4f4f4; border-color: rgb(221, 221, 221) rgb(221, 221, 221) rgb(221, 221, 221) rgb(46, 204, 113); border-image: initial; border-style: solid; border-width: 1px 1px 1px 5px; color: #333333; font-family: "Courier New", Courier, monospace; overflow-x: auto; padding: 15px;">./imapsync ... [other options] ... --maxage 90</pre><p style="color: #333333; font-family: Arial, sans-serif;">Once the recent emails are transferred, simply remove the <code style="background-color: #f9f2f2; border-radius: 4px; color: #c0392b; font-weight: bold; padding: 2px 5px;">--maxage 90</code> flag and run the script again. Imapsync will skip the emails that are already there and download the older ones in the background.</p><h2 style="border-bottom: 2px solid rgb(236, 240, 241); color: #2c3e50; font-family: Arial, sans-serif; margin-top: 30px; padding-bottom: 10px;">Important Considerations</h2><ul style="color: #333333; font-family: Arial, sans-serif; margin-bottom: 20px;"><li style="margin-bottom: 10px;"><strong>Disable <a class="b-tooltip-container" data-preview="" href="https://www.google.com/search?ved=1t:260882&q=disable+sleep+mode&bbid=8371891515989187603&bpid=3578947612971807267" target="_blank"><span class="b-tooltip" style="display: none;"><iframe src="/share-widget?w=poi&o=t&u=https%3A%2F%2Fwww.google.com%2Fsearch%3Fved%3D1t%3A260882%26q%3Ddisable%2Bsleep%2Bmode%26bbid%3D8371891515989187603%26bpid%3D3578947612971807267"></iframe></span>Sleep Mode</a>:</strong> Since the data passes through your computer (Server A > Your PC > Server B), ensure your computer does not go to sleep during the process.</li><li style="margin-bottom: 10px;"><strong><a class="b-tooltip-container" data-preview="" href="https://www.google.com/search?ved=1t:260882&q=define+bandwidth&bbid=8371891515989187603&bpid=3578947612971807267" target="_blank"><span class="b-tooltip" style="display: none;"><iframe src="/share-widget?w=poi&o=t&u=https%3A%2F%2Fwww.google.com%2Fsearch%3Fved%3D1t%3A260882%26q%3Ddefine%2Bbandwidth%26bbid%3D8371891515989187603%26bpid%3D3578947612971807267"></iframe></span>Bandwidth</a>:</strong> This process uses your internet bandwidth. If you migrate 30GB of data, you will download 30GB and upload 30GB.</li><li style="margin-bottom: 10px;"><strong>Resuming:</strong> If your internet connection drops, don't worry. Just run the script again. Imapsync will pick up exactly where it left off.</li></ul><p style="color: #333333; font-family: Arial, sans-serif;">Using <code style="background-color: #f9f2f2; border-radius: 4px; color: #c0392b; font-weight: bold; padding: 2px 5px;">imapsync</code> has saved me hours of work and prevented local storage issues. I hope this guide helps you with your next server migration!</p>
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<h1>The Ultimate Guide to Server-to-Server Email Migration Using Imapsync</h1>
    
    <p>Migrating email accounts from one hosting server to another is often a nightmare for IT administrators and hosting resellers. The traditional method involving Outlook (downloading emails to a local PST file and re-uploading them) is slow, prone to errors, and consumes massive amounts of local disk space.</p>

<p>In this tutorial, I will show you how to migrate emails efficiently using <strong>Imapsync</strong>. This tool transfers emails directly between servers using the IMAP protocol, preserving your folder structure and saving your local storage.</p>

<h2>What is Imapsync?</h2>
    <p><strong>Imapsync</strong> is a command-line tool for Linux that synchronizes mailboxes between two IMAP servers. It is "idempotent," meaning you can run it multiple times without creating duplicate emails—it simply resumes where it left off.</p>

<h2>Prerequisites</h2>
    <ul>
        <li>A computer with a Linux terminal (If you are on Windows, use <strong>WSL</strong> - Windows Subsystem for Linux).</li>
        <li>The hostname of the old server (e.g., <code>old.server.com</code>).</li>
        <li>The hostname of the new server (e.g., <code>new.server.com</code>).</li>
        <li>Usernames and passwords for the email accounts on both servers.</li>
    </ul>

<h2>Step 1: The Password File Trick (Crucial!)</h2>
    <p>Many email passwords contain special characters like <code>@</code>, <code>$</code>, or <code>!</code>. If you type these directly into the command line, Linux might misinterpret them, causing errors. The safest way is to save the password in a text file.</p>

<p>Open your terminal and create a password file (assuming all accounts use the same migration password):</p>
    
    <pre>echo 'YourSecurePassword123' > pass.txt</pre>
    
    <p><em>This creates a file named <code>pass.txt</code> containing your password.</em></p>

<h2>Step 2: Migrating a Single Account</h2>
    <p>To migrate a single email account, use the following command structure. Note that we are using <code>--passfile</code> instead of typing the password directly.</p>

<pre>./imapsync --host1 old.server.com --user1 info@old-domain.com --passfile1 pass.txt --ssl1 \
           --host2 new.server.com --user2 info@new-domain.com --passfile2 pass.txt --ssl2</pre>

<div class="note">
        <strong>Tip:</strong> You can add the <code>--dry</code> flag at the end of the command first. This performs a "simulation" to check if the credentials and connection are correct without actually moving any data.
    </div>

<h2>Step 3: Batch Migration (Automating Multiple Accounts)</h2>
    <p>If you have 10, 15, or 50 email accounts, typing the command one by one is tedious. Here is a Bash script I used to migrate 15 accounts automatically.</p>

<p>Create a file named <code>migrate_all.sh</code> using the command <code>nano migrate_all.sh</code> and paste the following code:</p>

<pre>#!/bin/bash

# --- Configuration ---
HOST1="premium264.web-hosting.com" # Old Server
HOST2="premium909.web-hosting.com" # New Server
PASSFILE="pass.txt"
DOMAIN1="old-domain.com"
DOMAIN2="new-domain.com"

# --- The Loop ---
for user in "${users[@]}"; do
    USER1="${user}@${DOMAIN1}"
    USER2="${user}@${DOMAIN2}"

echo "========================================="
    echo "Syncing: $USER1  --->  $USER2"
    echo "========================================="

echo "Batch Migration Completed!"</pre>

<p>Save the file and run it using: <code>bash migrate_all.sh</code></p>

<h2>Pro Tip: Migrating "Recent" Emails First</h2>
    <p>If you have huge mailboxes (e.g., 10 years of data), migrating everything at once might take days. To let your clients start working immediately, you can migrate only the last 3 months (90 days) of emails first.</p>
    
    <p>Simply add the <code>--maxage 90</code> flag to your command:</p>

<pre>./imapsync ... [other options] ... --maxage 90</pre>

<p>Once the recent emails are transferred, simply remove the <code>--maxage 90</code> flag and run the script again. Imapsync will skip the emails that are already there and download the older ones in the background.</p>

<h2>Important Considerations</h2>
    <ul>
        <li><strong>Disable Sleep Mode:</strong> Since the data passes through your computer (Server A > Your PC > Server B), ensure your computer does not go to sleep during the process.</li>
        <li><strong>Bandwidth:</strong> This process uses your internet bandwidth. If you migrate 30GB of data, you will download 30GB and upload 30GB.</li>
        <li><strong>Resuming:</strong> If your internet connection drops, don't worry. Just run the script again. Imapsync will pick up exactly where it left off.</li>
    </ul>

<p>Using <code>imapsync</code> has saved me hours of work and prevented local storage issues. I hope this guide helps you with your next server migration!</p>

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Migrating email accounts from one hosting server to another is often a nightmare for IT administrators and hosting resellers . The traditio...

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January 2026

The Ultimate Guide to Server-to-Server Email Migration Using Imapsync

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