I installed new SSL Certificates for eskimo.com today and unfortunately although they worked correctly for Apache they are NOT working for sendmail / postfix.  The latter two are saying the key does not match the cert even though it’s the SAME key and certificate apache is using, so not sure what is going on with this but am restoring old certs from backup while I work to resolve this.  Mail exchange with other sites or your mail client MAY fail during the time it takes to restore from backups.