Opensmtpd with multiple certificates

[Mik J]

Hello,
I would like to know if it's possible to use multiple certificates/keys with 
opensmtpd
domain.com has MX mx.domain.comacme.com has MX mx.acme.com
When a clients (remote mta such as gmail) connects to my server, my opensmtpd 
should send the according certificate.Something like virtual hosts with httpd
Otherwise, what should I do when my opensmtpd server hosts multiple domaines 
with multiple mx records.
Thank you