What to install for a Mailserver and DNS Server

[tommi2day]

I am moving from synology and up to now use there Mailserver und DNSServer apps. I couldnt find similar to install in TOS5.1, but found some hints for a mailserver app within the TOS5 help and in the internet also a Beta DNS Server package. Are these Apps retired or what you recommand to store emails (IMAP) and sent Emails(SMTP and what to use as DNS Server with Gui replacement.

THX
Thomas