So I've run into an odd issue when attempting to update our primary email domain, we currently have several IP's and SSL certs working well and under localhost > Properties > SSL we have oldmaildomain.co set as the default SSL Certificate. Everything works fine including people connecting to newmaildomain.com.
However, if we change the default cert to newmaildomain.com nobody can connect via IMAP to the oldmaildomain.co with the error, "the server for this account is not contactable". When I switch the MAPI connector to use newmaildomain.com for IMAP but oldmaildomain.co for SMTP it connects, so this odd issue only effects IMAP.
Switching the Default SSL certificate back to oldmaildomain.co makes everything work again.
It can be noted that we have bindings for both domains under Localhost > Properties > General
Seems like a bug,
Any ideas on what might cause this?