SymptomsThe issue appears when AtMail MTA is used. When receiving a forwarded message with an attachment, you will see the prefix .save added to the attachment name. Here are the steps to reproduce the issue:
1. Send an email with an attachment named "file.name" from email@example.com to firstname.lastname@example.org.
2. Receive the email with email@example.com and forward it to firstname.lastname@example.org using the "Forward" button.
3. Receive the email with email@example.com and verify that the attachment name is changed to "file.name.save."
ResolutionThe hotfix for AtMail version 1.0.5, which is used in Parallels Plesk Panel 10.x and 11.x, is attached.
To install it, download the archive and extract the file into this directory: /var/www/atmail/libs/Atmail. Verify md5sum:
~# md5sum /var/www/atmail/libs/Atmail/SendMsg.php