SSL accept error

Hello, I am having some trouble isolating an issue with my mail server. In my mail log  I keep receiving the following errors:

SSL_accept:failed in SSLv3 read client certificate A

SSL_accept: error form client@mydomain.com: lost connection

SSL_accept:SSLv3 flush data

I have look through both my dovecot and postfix configs but have not been able to isolate the issue yet, hoping someone might be able to help.