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When your issuance email arrives, it will contain three certificates: The webserver certificate, GTE root certificate, and a Comodo CA intermediate certificate. You will only need your server certificate and the Comodo CA intermediate certificate.
Copy the Comodo CA intermediate certificate (Comodo Class 3 Security Services CA) into a text editor and save as ca.txt (bundle file).
Copy your web server certificate into a text editor and save as yourdomain.crt.
smtpd_tls_cert_file = /some/path/yourdomain.crt smtpd_tls_key_file = /some/path/yourdomain.key smtpd_tls_CAfile = /some/path/ca.txt (bundle file)
Be sure your setup is similar to the following examples:
smtpd_use_tls = yes
smtpd_tls_auth_only = yes
smtpd_tls_session_cache_timeout = 3600s