There is relatively new anti-spam tool - Rspamd. I think, it worth to be integrated with Plesk as an alternative to SpamAssassin. It shows better performance as the author says here http://rspamd.com/misc/2016/03/03/rspamd-performance.html

There is an spam filtering option to "Move to spam folder XXXX" on Linux, but not on Windows (Plesk 11+).

Unfortunately, horde doesn't work so well and every time when a message with broken header arrives, horde displays "Invalid Address" and no subject to all inbox messages. The described fix in https://kb.plesk.com/en/121175 doesn't work in this cases, forcing us to find the broken message manually (or scripting something to do the dirty job).

This feature should exists in Windows env as in Linux.

Plesk does not currently support DNS Whitelists like it does RBLs, such as the list at dnswl.org. There needs to be a way to add this from the Plesk UI.
The Postfix main.cf config directive is permitdnswlclient.
Whenever a Plesk upgrade happens, the setting, if added is removed and needs to be added back manually.

Hi,
plz add mailman 3 as mailinglist software.

Use case: One of our customer has uploaded files to his ftp server in a public internet cafe and his password was stolen. Afterwards there was a mass spam mail sending script on his webserver. Our server has been landed in black lists. It was very difficult to find and correct it.

I would like to enable and configure fetchmail on mailbox level. Main reason is easy migration for customers to new hosting providers including moving mails from existing mail servers.

"fetchmail" is already installed together with PLESK, needs just to get properly configured.

DKIM - needed to import own keys

It is not fair solution that Plesk generate a private key, and i cannot extract and date them in a seperate Backup

Please let us import our own DKIM keys

This would allow you to see mailboxes that are no longer in use.

To use Sympa instead of Mailman

Sometimes is useful check the details about POP3/IMAP/SMTP traffic for a single email, to look and find problems.

Allow users and admin to select subject lines and keywords as well as keywords in the email body to be added to the spamfilter blacklist.

Currently spammers are just changing domains and sending the same email templates.

Hello,
I miss the functionality of managing a blacklist of target email addresses in case you have a catchall email domain.
In most cases, the originator address of spam emails changes every time, but the target address is frequently used.
So with this functionality, I could drop out invalid recipient addresses, without giving up the setup to use catchall all emails <everything>@your-domain.
This is useful to register webshops or community everytime using a separate target email address to distinguish incoming email if they are valid or not.

It would be useful to be able to configure auto replies so that they start automatically on a specific date.

If I don't want to forget to set it before leaving.. or i'm sure there's many reasons!

Roundcube for Windows

http://forum.odin.com/threads/dovecot-mdbox-and-altmove-support-in-plesk.334620/

It would be really handy if we could, via Plesk panel or some cli utility, o switch from Maildir to mdbox as mailbox storage format and enable alternate storage for old emails. This way we can optimize the disk usage by using the fast storage media for recent emails, while the old stuff can go on a slower, cheaper media. Will also help a lot in growing our mail customer base without forking out ridiculous amounts of money for expensive fast disks arrays to keep up with the growth rate.

For better SPAM Protection it would be nice to add an Option to let the Mailserver check, whether senders Domain is existing or even not.

I got Mails from "Domain.xyz" wich is of Course no valid TLD.
"Reply-To" is of Course an valid Mail adress.

On request, my Data-Center told me they could activate that Option, but while Plesk is Controlling that config, on next Plesk update the Change gets lost.

So: Could you add in Plesk that Feature as an Option?

It seems difficult to manually install a mobile skin on Roundcube, and if it should succeed the plesk would overwrite the config made on updates. The default skin provided with plesk should support mobile devices, as this is an important feature nowadays.