Postfix: sender-dependent SASL authentication — relay to multiple SMTP hosts, or relay to the same host but authenticate as different users (e.g., two Gmail accounts)

I would like to send mail from two different Gmail accounts using Postfix.

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
    account1[@]gmail.com account1[@]gmail.com:passwd1
    account2[@]gmail.com account2[@]gmail.com:passwd2

    # default relayhost
    [smtp.gmail.com]:587 default_account[@]gmail.com:default_passwd

/etc/postfix/sender_relay:
    account1[@]gmail.com [smtp.gmail.com]:587
    account2[@]gmail.com [smtp.gmail.com]:587

Create maps:

postmap sasl_passwd sender_relay

Restart postfix and test:

To send an email from account1[@]gmail.com, use sendmail with the -f sender option (set the envelope sender address):

sendmail -f account1[@]gmail.com -t <<EOF
To: barney[@]example.net
Subject: Hey, I successfully configured Postfix with sender-dependent SASL authentication!
Content-type: text/html

<b>Isn't this awesome?</b>
EOF

as of 2/2015:
https://gist.github.com/zmwangx/2c56aa32be68daf48c2f

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