In 13.2, I'm curious how this could be setup? Suppose you have two domains:
1) mail.domain2.com bound to 10.1.1.2
2) mail.domain3.com bound to 10.1.1.3
While each domain can be bound to an IP within SmarterMail, when in Security > Bindings > Ports, there is no setting to bind port 465 independently to each IP so therefore only one SSL certificate can be bound to the SMTP port listening on 465. The only way I can see this working is if you assign a different alternate port for each protocol to which an SSL cert will be bound for the second domain.
Am I overlooking something?