It would be useful to be able to add domains to IgnoreMailFrom rule for DMARC check from Plesk interface.

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 domain reputation based spam protection lookup such as the feed from dbl.dq.spamhaus.net, in addition to the existing IP DNSBL.

An option to choose IP for outgoing mail on domain basis.

For now, only below options available:
- all the domains send from particular IP
- each domain uses its IP address

This feature is for use case when one or several domains can send through one IP address, and the others through another one.

It should be managed independently of web hosting IP address.

For now SpamAssassin on Plesk for Windows does not add any headers to mail messages which were processed by it and not identified as spam. It would be good feature to add header showing that SpamAssassin actually processed this messages to all mail messages, even not spam one.
This could be helpful in order to monitor SpamAssassin functionality to understand if it works in general or not. Plus, some Spam checkers may show that mail inside mailbox were not checked at all, which is concerning.

In order to comply with RFC3834 the auto replay function should consider the X-Auto-Response-Suppress header. Also not replaying to mail with Auto-Submitted: auto-generated would be nice.

the gdpr request to change password every 6 month. it would be nice every 6 month remember to client to change password.
witha link to a dedicate page to change pwd ( out webmail ) and with captcha or other security system.

Implement Dovecot LMTP.
Currently LDA is used for mail local delivery.
LMTP has a better performance and using it allows to avoid "Inotify instance limit for user (UID popuser) exceeded, disabling. Increase /proc/sys/fs/inotify/maxuserinstances" issues.

https://workaround.org/ispmail/jessie/postfix-dovecot

Please add functionality to configure redirection of single domain webmail.example.com to another URL

Currently, it is possible to apply it using the workaround:

https://support.plesk.com/hc/en-us/articles/360003509474-How-to-redirect-single-domain-webmail-example-com-to-another-URL

Configure a mail user to send mail only to other addresses in the same domain. And not to external addresses.

Now i have to insert a mailadresse at each mailaccount-blacklist.
i think it easier to use, i im able to handle a whiltelist/blacklist for all mailaccounts

It would be great to have an option to set limit outgoing email per day, not only per hour.

When there is a SmarterMail service running on the same server with Plesk, it would be great to have an option to create an account in Plesk with the same domain and attach the SmarterMail content.

Currently Plesk has not remove the domain from the remote SmarterMail server and just disabled the it due to business logic (When a subscription is suspended, mail service and hosting service will be temporarily stopped to avoid losing mail data)

Add possibility remove domain from remote SmarterMail, when mail service disabled by administrator manually

According to Postfix documentation, multiple Postfix instances are supported. Would like to have such support implemented in Plesk
http://www.postfix.org/MULTI_INSTANCE_README.html

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.

Plesk should be able to create email groups. Most email servers, including the MailEnable that comes with Plesk, implement email accounts, email lists, and email groups in quite different ways. Plesk allows us to create email accounts and mailing lists, but it does not allow us to create email groups. Instead, to get the result that an email group offers, in Plesk you need to create an email account, disable the email box and set up forwarding to addresses that are part of the "group" . This is a little weird.