vivek.agrawal wrote:
relayhost=smtp.gmail.com
If you want to use GMail as a smarthost relay, you need to enable SASL
authentication and TLS on Postfix's smtp transport and provide a
username and password for GMail's server. There's a section[1] in the
SASL_README on this. To enable TLS, you'll need to set:
smtp_tls_security_level = may
You'll also want to alter relayhost to use gmail's secure submission
service:
relayhost = [smtp.gmail.com]:587
There are other relevant settings you may want to set, such as session
caching, a CA database, and limits on ciphers and SASL mechs. It's all
documented in either the SASL_README or in the list of all main.cf
parameters[2]. The parameters are all begin with either smtp_tls_ or
smtp_sasl_.
1: http://www.postfix.org/SASL_README.html#client_sasl
2: http://www.postfix.org/postconf.5.html
