I am the only user on my home machine, so although I could configure my mail user agents, Thunderbird and alpine, to relay to Gmail directly, I preferred to set up Postfix as a relay.
There are many tutorials on how to do this, for example this one from Howtoforge so I will not go over familiar territory. However if you find that Gmail is giving you an authorization required error in your Postfix logs, you need this setting:
smtp_sasl_security_options = noanonymous
A lot of tutorials fail to mention this.
Also if you find in the logs that Postfix is attempting to connect to the IPv6 address of Gmail, and you don't have a IPv6 capable connection with your ISP, then you might want to set this:
inet_protocols = ipv4
There are many tutorials on how to do this, for example this one from Howtoforge so I will not go over familiar territory. However if you find that Gmail is giving you an authorization required error in your Postfix logs, you need this setting:
smtp_sasl_security_options = noanonymous
A lot of tutorials fail to mention this.
Also if you find in the logs that Postfix is attempting to connect to the IPv6 address of Gmail, and you don't have a IPv6 capable connection with your ISP, then you might want to set this:
inet_protocols = ipv4
You may not notice this without looking at the logs because Postfix retries with IPv4 after giving up on IPv6, so there will be a delay relaying the mail.
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