It is difficult to identify the offending website, and this would help tracking it down

This is a feature that needs to be brought to the Plesk Control Panel.

This request has been outstanding since Plesk 10:
http://kb.parallels.com/en/113938

This wasn't possible in Plesk 11.5.
http://kb.parallels.com/en/121606

It still does not appear possible in Plesk 12.

At the very least, breaking a domain out into its own subscription would be a good first step.

Search words:
I cannot move domain to another subscription
move webspaces
move a domain within a multi-domain subscription
multi-domain subscription
migration manager
transfer a domain
separate subscription
split subscription
break out domain from subscription

Is easy to use.

Keep two (or more) Plesk servers in sync for a failover scenario.
Migration Manager only allows manual "sync"

ActiveSync is a necessary tool for most businesses today as it allows them to have everything in one place and stream it automatically to every device they use. Users with mobile phones and tablets can easily sync their contacts, calendars, notes and emails via activesync and users with outlook and other mail clients can sync contacts, mail and perhaps notes.

I'm wondering if Plesk also will implent HTTP Strict Transport (or HSTS) Security in the GUI. It's an extra layer of security for sites who need to be extra secure.

It's being done with a special header (mod_headers for Apache) and a TLS connection. The client (browser) can then verify if the server is the real server and not a man-in-the-middle server/attack.

It's as simple as adding the following code to the vhost config (HTTPS only!):

Apache:
Header always set Strict-Transport-Security "max-age=31536000; includeSubDomains"

Nginx:
add_header Strict-Transport-Security "max-age=31536000; includeSubDomains";

It would be a great idea to be able to import mail for individual email accounts via POP3 from other servers.

This would be great for customers migrating to you so that they can keep all their email.

Would just need fields such as:
-Hostname
-Username
-Password
-Port
-Encryption

Include memcache and settings for ram etc as standard.

autodiscover for email settings for linux and windows

Please, add support to asp.net core in plesk 17 for linux.

It should be possible for the admin user to change his user login name. The name "admin" is not very secure, because it's easiert to hack via brute force. The hackers know, the name is "admin". If the user would be able to change his login name, it would increase the security of Plesk Panel.

Now you have two opportunities to set the spamfilter - server-wide or individual. It would be very handy if the admin or the customer could set the spamfilter for the whole subscription or/and for the whole domain.

As descriebed earlier

PIWIK is death!
Simple Matomo-plug-in installation without additional configuration for the databases or the host

Add subdomains to one Let's Encrypt certificate.

Why?

Because Let's Encrypt has currently limit 5 certificates / 7 days on one domain.

Example: in one Let's Encrypt cerftificate will be this DNS names: example.com; www.example.com; sub1.example.com; sub2.example.com

I think it will be helpful if you can simply add your own domains and subdomains in Let's Encrypt Certificate.

Thanks!

Make separate limits on Mail and Web disk spaces, so that hoster could sell one limit for web (i.e. 2Gb) and another limit for mail (i.e. 10x2Gb mailboxes)

Firewall should be able to block the IP of the selected country. I have a lot of traffic from the IP 5.10. *. *