Upgrade MailEnable in Windows editions to support SSL/TLS
The Windows edition of Plesk is currently using MailEnable as its E-Mail server and it is a community edition (Standard) which does not support secured services such as SMTP/s, IMAP/s, POP3/s. So its the only problem for us to get PCI compliance unless we buy it ourselves with a higher annually price. The Plesk company may deal with them for upgrading at least to the Professional edition and make it available in licensing with a suitable monthly price.
Good news everyone :)
Starting Plesk Onyx 17.5 the installation contains Mail Enable 9.10, which supports SSL/TLS in Standard edition.
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Harry commented
I'm offered the choice of MailEnable or Horde but both seem to be require plain text passwords in windows. Are there no *other* alternatives that implement proper security by default?