How to export emails from Plesk?
There is no direct feature to exports emails from Plesk.
As a workaround, it is possible to download emails using one of the following approaches:
Create mail backup in Plesk:
Go to Domains > example.com > Backup & Restore > Back Up.
Select "Mail messages" and "Configuration" only.
Press OK to create a backup.
Create mail backup from the file system directly
Connect to the server via SSH.
Create a backup of the email folder for a customer. For example:
# tar -zcvf jdoe_example.com.tar.gz /var/qmail/mailnames/example.com/jdoe/
Note: replace jdoe and example.com with appropriate system user and domain name.
Download emails using webmail interface
Note: skip "Step 1" from the instruction above for both Roundcube and Horde.