Hi, After having success with checking validity of http domains using "check_http -S --sni" for multiple certificates running under the same IP I tried that way for checking SIMAP with the same feature.
It seems that the check_simap tool doesn't support "--sni" yet. As my dovecot installation uses different vertificates depending on the domain name I'm unable to verify the validity of the secondary certificates. http://wiki.dovecot.org/SSL/DovecotConfiguration states not all clients are able to use SNI yet, but someone must start, so the nagios plugin might be an easy try I think. Or are there any workarounds known?
