Re: TLS Encryption and Verification issue

[Deeztek Support]

Certificate chain
  0 s:/C=US/ST=California/L=Mountain View/O=Google Inc/CN=mx.google.com
    i:/C=US/O=Google Inc/CN=Google Internet Authority G2
  1 s:/C=US/O=Google Inc/CN=Google Internet Authority G2
    i:/C=US/O=GeoTrust Inc./CN=GeoTrust Global CA
  2 s:/C=US/O=GeoTrust Inc./CN=GeoTrust Global CA
    i:/C=US/O=Equifax/OU=Equifax Secure Certificate Authority
Do you have the root certificate?

Yes the certificate for Equifax Secure Certificate authority is added in 
the /etc/ssl/certs/ca-certificates.crt file

Did you tell Postfix what name to expect in the server certificate?
It does not contain the name alt4.gmail-smtp-in.l.google.com.

what do you mean by that? Are you referring to the alternate names on 
the cert?