Unable to import mail messages if default location of mailboxes was changed

Symptoms

• Attempt to import mail messages fails with the following error:

  PLESK_ERROR: Failed to connect to the source server and copy mail messages
  stderr: Internal error of mail migrator: [Errno 2] No such file or directory: ‘/var/qmail/mailnames/example.com/mail/Maildir’

• Location of mail content has been changed according to the following article:
  How to change the default location of mailboxes in Plesk for Linux

Cause

Mail import does not support customized mail path. This is Plesk bug with ID PMT-4585 which will be fixed in future Plesk updates

Resolution

1. Connect to the server via SSH;

2. Create symlink to the new MailDir:

   # ln -s /custom/location /var/qmail/mailnames/