Sometimes it is required to use another sender FROM without changing it automatically.

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

Add delete/reject option for addresses and or domains in the blacklist. If I've blacklisted a domain, chances are that I don't want anything from that source.

There is White List under Tools & Settings > Mail Server Settings, it is used by SpamAssassin.

MailEnalbe has also White List under Servers > localhost > Services and Connections > SMTP > Properties > Whitelist.

MailEnalbe Whitelist cannot be managed through Plesk.

It would be nice, to have ability to manage MailEnalbe Whitelist in Plesk interface

Implement feature to configure mails sent to domain hosted in Plesk be delivered to external mailserver if mailbox does not exist in Plesk.

Currently, it is possible to create hourly limits for outgoing mail.
It will be useful to be able to configure it for other timeframes, such as Monthly outgoing mail limits.

Hello.

Currently Outgoing Mail Limit counts local forwarded messages from existing mail boxes:
https://docs.plesk.com/en-US/onyx/administrator-guide/mail/protection-from-outbound-spam.71349/

Please add functionality to exclude messages forwared to the local mailboxes from counting by Outgoing Mail Limit.

Add a Tag for the notification emails for the Public IP address of a server. If a server is using NAT when the <ip> Tag is used it shows the Private IP address in the Site Notification emails instead of the Public IP address.

Provide the ability to modify sender's name when configuring an auto-reply on Plesk.

I need to restrict some email addresses to send emails to specific domains. For example, x@test.com should only be able to send emails to y@mydomain.com and z@yourdomain.com but x@test.com shouldn't be able to send emails to any domain other than these two. In other words, an email from x@test.com shouldn't go to ab@test2.com

Allow users to export and import anti-SPAM mail filters via the UI.

Mail autodiscover in Plesk Obsidian does not support the latest Outlook version 2019 and O365.
Developing support to Microsoft proxy servers for autodiscover requests is required.

When Enable mail autodiscover AND Enable SMTP service on port 587 on all IP addresses are enabled within the Server-Wide Mail Settings, it'd be nice if Plesk would also create an according SRV record.
_submission._tcp IN SRV 0 1 587 mail.domain.tld.
Currently, Plesk only creates smtps with 465.
See https://datatracker.ietf.org/doc/html/rfc6186#section-3.1

Make Plesk webmail capable of reading/decompressing ZStandard-compressed mail files.

Would be very helpful if we could edit the email queue for subscriptions without server-wide admin rights. Unfortunately, as a Plesk user, I cannot edit the email queue in my subscription.

In Courier IMAP with qmail, when the mailbox exceeds usage limit, mails for this mailbox get bounced. Bounced mails are not displayed in Plesk panel and can be checked only on the server side. And in this case, mails queues from Plesk and server are different which can be confusing.
Therefore, it would be convenience to have a feature that can manage and remove the bounced mails from the Plesk UI.

Ability to use MySQL as an extension to Dovecot
Business case: using MySQL database for centralized authentication to email accounts.

Allow greylisting control individually per user, while maintaining the control on a subscription/level, not server-wide

We use the following configuration on Plesk for Windows: in MailEnable postoffices folder, domains' folders are junctions to folders inside subscriptions' web folder (e.g. C:\inetpub\vhosts\example.com\email). In Plesk Onyx with such setup, statistics were calculated successfully but in Obsidian, it stopped counting the size of junctions, so the mail statistics is counted as 0.
This setup is important for us, so please return the support for domains' mail folders as junctions.