Mail send via Relay host on Ubuntu Server: Difference between revisions

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Source:
* [https://superuser.com/a/280205/664884 SuperUser: How do I change postfix port from 25 to 587?]
* Note: With this configuration, all mail must be sent using your Gmail address as "From", unless you have setup your Gmail (Settings>Accounts and Import>) to "Send mail as" some other, then you cold use these email addresses.


== Setup Gmail as Relay host ==
Edit <code>/etc/postfix/main.cf</code> as follow.
Edit <code>/etc/postfix/main.cf</code> as follow.
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sudo postmap /etc/postfix/sasl_passwd && sudo postfix reload
sudo postmap /etc/postfix/sasl_passwd && sudo postfix reload
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== References and Notes ==
* Super User: [https://superuser.com/a/280205/664884 How do I change postfix port from 25 to 587?]
* Google Support: [https://support.google.com/accounts/answer/185833?hl=en Sign in with App Passwords]
* '''Note:''' With this configuration, all mail must be sent using your Gmail address as "From", unless you have setup your Gmail (<code>Settings</code>><code>Accounts and Import</code>>) to "Send mail as" some other, then you cold use these email addresses.
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Revision as of 12:06, 22 September 2022

Lin­ux Serv­er

Set­up Gmail as Re­lay host

Ed­it /etc/postfix/main.cf as fol­low. 

sudo nano /etc/postfix/main.cf
#Ap­ply
# This tells Postfix to hand off all messages to Gmail, and never do direct delivery.
relayhost = [smtp.gmail.com]:587

# This enables TLS (SMTPS) certificate verification, because Gmail has a valid one.
smtp_tls_security_level = verify
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
smtp_tls_session_cache_database = btree:/var/run/smtp_tls_session_cache

# This tells Postfix to provide the username/password when Gmail asks for one.
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous

In /​​​etc/​​​postfix/​​​sasl_​​​passwd, add your Gmail user­name and pass­word. 

sudo nano /etc/postfix/sasl_passwd
#Ap­ply
[smtp.gmail.com]:587    user-name@gmail.com:app-password

# Note you must setup App Password at https://myaccount.google.com/u/0/apppasswords

Com­pile the sasl_​​​passwd file in­to a data­base and re­load Postfix's main con­fig­u­ra­tion. 

sudo postmap /etc/postfix/sasl_passwd && sudo postfix reload

Ref­er­ences and Notes

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