The actual MailQueue status is useless, becaus the "status" of the email isnt viewed. This contains the important information for mails with problems.... Please expand it with the status, like it is done win Webim for example

No suggestion, but a critical, urgent, overdue feature request, as described in many "suggestions" since years:
Secure
mail.customerdomain.tld
webmail.customerdomain.tld
with Let´s Encrypt certificate without having to set the DNS A Record for
customerdomain.tld
to the mailserver IP.
And withouth having WAF disabled (SSL It 1.20 is being blocked bei Comodo (free) and Atomic (free) rules, other not tested yet).

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

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.

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!

Add the ability to download/upload a list of the domains from Whitelist of Blacklist (Tools&Settings > Mail tab) as a text file so it is possible to add all the required domains at once.
The following Uservoices matching this feature were already created serveral times:
https://plesk.uservoice.com/forums/184549-feature-suggestions/suggestions/15998113-server-wide-e-mail-settings-blacklist
https://plesk.uservoice.com/forums/184549-feature-suggestions/suggestions/17805055-download-and-upload-for-the-email-blacklist-in-ord
https://plesk.uservoice.com/forums/184549-feature-suggestions/suggestions/6345455-mail-server-settings-bulk-emails

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.

Rotate the SMTP sending IPs to the server level for example every 10 minutes.

Way to filter Mail log via Panel (only for admin), it is necessary to view messages statistics for particular mail account.

Not sure how can this be implemented but mailboxes getting full from messages(spam) that gmail does not download

It would be nice if there is a way to auto clean undownloaded messages after a while

even as a bash/cron script would be nice

Mail authentication brute force attacks generate additional traffic.
It is counted as a part of POP3/IMAP traffic statistics in Plesk for Windows.
Please add functionality to recognize and ignore such normal traffic so that it does not forge POP3/IMAP statistics.

Allow changing the percentage when the mail quota warning is sent, in small sized mailboxes the 95% could be almost to late.
So it would be good to have an option to adjust it for example to 85% or other values.

We would like to make the emails to be sent from our Ticketsystem mail and not from the Plesk admin mail

Plesk admin should have control over all possible mail notifications sent by Plesk. For example, Plesk admin should be able to enable/disable notifications which inform that Plesk failed to generate web server configuration files. Some Plesk owners may already have checks and notification mechanisms in place for Nginx/Apache, as well as several other services.

It would be a good idea to be able to set mail filtering for emails with specific Subjects in Plesk Email Security extension.