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Is there SNI support for SMTP/IMAP/POP3?
SNI support is dependent on the functionality of the mail server software.
Developers of most popular mail servers Postfix and Mail Enable are not planning to implement it.
Vote for this feature on Plesk UserVoice portal.
As workaround do the following:
- Adjust mail client software to use the domain name, which has the valid SSL/TLS certificate issued (e.g. mail.example.com has a valid SSL certificate), instead of mail.exampletwo.com (has no valid SSL certificate).
- In order to expose the server as secured to other mail servers in Internet, change MX DNS records for all domains from mail.exampletwo.com to mail.example.com.