Can not mark ham messages as spam serverwide on Plesk Email Security Pro. Many spam messages and senders look HAM but actually spam. This should be handled by server admin, not individual email clients.

create a specific mailbox on a domain which customer has access where he is unable to delete the email address, change it's passwords, disable it, etc.

like <request_subject> allows to repeat the subject in the auto-reply, it would be nice to have a similiar tag like "<request_body>" making it possible to include the sender's mail body in the auto-reply message body.
This would make the handling of web form request a lot easier on plesk.

Due to IT security implementations it is often necessary to know when users changed their password to force them to change it again.
From this change, new features could be added to improve the service.
-Number of saved passwords
-Force password change every x days
-Send password change reminder

It is quite annoying that when mails are detected as spam they are moved to the spam folder but there is no possibility in PLESK to mark them as read. In Thunderbird e.g. there is no possibility to do that automatically because the spam detection is done by an external spam detection (PLESK). So you always have a lot of unread mails in the spam folders.

When email specified at Scheduled backup notification it sent on behalf of user and failed due to SPF check

For example, if you set email for backup notification as test@example.com the email will be sent FROM test@example.com. And if it does not exist on server it may fail during SPF checl

It is expected that email sent FROM administrative email.

By current design of Plesk SSL certificates selected to secure webmail in Plesk doesn't secure IceWarp webmail URL.

Consider adding this functionality.

Add an option to the Mail Addresses page to expand all the forwarding emails. For example, rather than saying "(and 4 more)" list all 5 forwarding email addresses, not just the first one for each email address on the display.

Please make Plesk Premium Email available as a PWA (Progressive web apps).

So that we could "install" Roundcube as a PWA on our Phones.

Add an ability change the mailbox quota threshold and send the mailbox quota warnings to server administrator or to a specified mailbox.

You should add a simple option to specify mail server hostname when autodiscover is enabled on domain level...

example:
main.domain -> Web
mail.main.domain ->Mail server (this one should be in autodiscover xml response for incoming/outgoing hostname )

At this time, access to spamfilter settings for a mailbox are only possible for admins and website owners. Pls make it possible for logged in mailbox users to access and edit there own spamfilter settings.
It's very important, because on website's with many mailboxes, the admin often cannot support all users in setting up there spam settings.

Is it currently possible to set only one mailbox to forward the mail for non-existent users in Domains > example.com > Mail > Mail Settings > Forward to address.
Please allow to add more than one email address for this setting.

Hello,

At the moment mail server shipped with Plesk is not able to store or handle emails compressed by Gzip on the file system.

Please add functionality to support compresses emails or option to enable email compression.

Add an option to set a delay to the Postfix auto-reply. Currently, it sents instantly.

Having a built-in REST API for IMAP, either similar to or compatible with the Gmail API would be amazing, especially if you could limit user rights in Plesk so that you could have domain specific access, or read-only access etc. The imapapi linked to nodemailer is a huge step forward but integration with Plesk would be ideal since security is paramount for an API that can access mail. Obviously this is a long-term request.

Hello,

Please add functionality which allows viewing mail statistics:
* How many messages were sent from the server?
* How many messages were received?
* How much spam emails were received?
* Detailed information per domain/mail account.

Since Kolab Syncroton does not enable sync on newly created folders, it should be enabled manually.

They would need to select the ActiveSync device ID, click to enable the synchronization of the folder and save the changes.

While it was nice if there will be an ability to do so automatically.

Add the count of messages in the postfix mailq to Advanced Monitoring and Grafana. Then we have the option to get alerts if mailq goes up, in case of spam events!