This is a sequel to "Postfix: relay to authenticated SMTP".
I would like to send mail from two different Gmail accounts using Postfix. Here is the relevant section in the Postfix documentation: Configuring Sender-Dependent SASL authentication.
As a concrete example, here's how to set up two Gmail accounts (only relevant sections of the config files are listed below):
/etc/postfix/main.cf:
# sender-dependent sasl authentication
smtp_sender_dependent_authentication = yes
sender_dependent_relayhost_maps = hash:/etc/postfix/sender_relay
# default relayhost setting
relayhost = [smtp.gmail.com]:587
# smtp authentication settings
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous
smtp_sasl_mechanism_filter = plain
smtp_tls_CAfile = /etc/pki/tls/certs/ca-bundle.crt
smtp_use_tls = yes
smtp_tls_security_level = encrypt
/etc/postfix/sasl_passwd:
# per-sender authentication
[email protected] [email protected]:passwd1
[email protected] [email protected]:passwd2
# default relayhost
[smtp.gmail.com]:587 [email protected]:default_passwd
/etc/postfix/sender_relay:
[email protected] [smtp.gmail.com]:587
[email protected] [smtp.gmail.com]:587
After editing the config files (sudo su), do
chmod 600 /etc/postfix/sasl_passwd
postmap sasl_passwd sender_relay
postfix reload
And you're all set.
To send an email from [email protected], use sendmail with the -f sender option (set the envelope sender address):
sendmail -f [email protected] -t <<EOF
To: [email protected]
Subject: Hey, I successfully configured Postfix with sender-dependent SASL authentication!
Content-type: text/html
<b>Isn't this awesome?</b>
EOF
Folks: There are no notifications for comments on gist, so I most likely won't see your questions. Go ask questions on Server Falt or Super User.
As for existing ones, although you most likely won't see my answers:
@subhomay: I don't use CentOS or any PHP mail script, so no idea.
@Taliez: This solution is for the honest use case of needing to send emails from multiple accounts for different purposes. This is not meant to be used for spamming from a fleet of accounts. If you're relaying more than 10k messages a day, you're apparently abusing the free service. If you're sending spam, stop it, right now. If you're sending legitimate email, having to send more than 10k messages a day probably means you're some kind of business, so you should be using a proper business solution like SendGrid.