How to Migrate Email Server from cPanel to Mailcow

Migrating from cPanel email to Mailcow involves transferring mailboxes, historical emails and DNS settings. Done correctly, downtime can be under 30 minutes.

Migration Plan

1. Set up Mailcow on new server
2. Create all mailboxes in Mailcow
3. Sync emails via IMAP using imapsync
4. Lower MX TTL to 300
5. Update MX records to new server
6. Run final imapsync to catch new emails

Step 1 — Install imapsync

sudo apt install imapsync -y

Step 2 — Create Mailboxes in Mailcow

Mailcow Admin → Mailboxes → create each mailbox that exists in cPanel

Step 3 — Sync Emails

# Sync single mailbox
imapsync   --host1 old.cpanelserver.com   --user1 [email protected]   --password1 "oldpassword"   --host2 mail.yourdomain.com   --user2 [email protected]   --password2 "newpassword"   --ssl1 --ssl2   --syncinternaldates

Step 4 — Bulk Migration Script

#!/bin/bash
# Add your mailboxes here
MAILBOXES=(
  "[email protected]:oldpass:newpass"
  "[email protected]:oldpass:newpass"
)

for MB in "${MAILBOXES[@]}"; do
  USER=$(echo $MB | cut -d: -f1)
  PASS1=$(echo $MB | cut -d: -f2)
  PASS2=$(echo $MB | cut -d: -f3)

  imapsync     --host1 old.cpanelserver.com --user1 $USER --password1 $PASS1 --ssl1     --host2 mail.yourdomain.com  --user2 $USER --password2 $PASS2 --ssl2     --syncinternaldates --nofoldersizes
done

Step 5 — Switch MX Records

# Lower TTL 24 hours before
yourdomain.com MX 10 mail.yourdomain.com  # new server

# Run imapsync one more time after DNS switch
# to catch emails received during transition

Conclusion

Email migrations require careful planning to avoid data loss. Our team handles complete email server migrations with zero message loss guaranteed.