On 07/25/13 11:00, Surgemail Support (Marijn) wrote:
> OK it does sound like the multiple domains per certificate would be
> ideal to use say one certificate for:
>        domain.com, mail.domain.com and even maybe imap.domain.com
> but at the same time I've not had that running myself and sound like
> others have had issues. Having said that I'm sure I have had positive
> reports of users having it working fine under surgemail.
.... snip ...

SubjectAltName works fine for each of [xyz].example.com for imaps and 
smtps in 6.3c2-2
Users have the full range of clients with only finger trouble getting 
the way.