Postfix for Gmail: Difference between revisions
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This is how to setup Postfix to use Gmail as a relay host, so it can send email via Gmail, e.g. for output of cronjobs etc. | This is how to setup Postfix to use Gmail as a relay host, so it can send email via Gmail, e.g. for output of cronjobs etc. | ||
== | == Option: use msmtp instead of postfix == | ||
Msmtp seems to be easier to configure, see [[ZFS#Mail_notifications_(ZFS_Event_Daemon)]] | |||
== Secrets Configuration == | |||
This page follows the configuration defined in <code>[https://github.com/Mic92/sops-nix sops-nix]</code>, but you can use any [[Comparison of secret managing schemes|secret managing scheme]]. | |||
== Add a "postfix/sasl_passwd" secret == | == Add a "postfix/sasl_passwd" secret == | ||
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# optional: Forward mails to root (e.g. from cron jobs, smartd) | # optional: Forward mails to root (e.g. from cron jobs, smartd) | ||
# to me privately and to my work email: | # to me privately and to my work email: | ||
virtual_alias_maps = "inline:{ {root=you@ | virtual_alias_maps = "inline:{ {root=you@work.example, you@home.example} }"; | ||
}; | }; | ||
}; | }; | ||
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'echo "This is a test email." | mail -s "Test Email from NixOS to root" root' | 'echo "This is a test email." | mail -s "Test Email from NixOS to root" root' | ||
== | == References == | ||
[https://discourse.nixos.org/t/porting-my-postfix-gmail-smtp-to-nixos/30286 Porting my postfix gmail smtp to nixos] on the NixOS Discourse. | |||
[[Category:Mail | [[Category:Mail Server]] | ||
[[Category:Server]] | [[Category:Server]] | ||
Latest revision as of 21:44, 18 September 2025
This is how to setup Postfix to use Gmail as a relay host, so it can send email via Gmail, e.g. for output of cronjobs etc.
Option: use msmtp instead of postfix
Msmtp seems to be easier to configure, see ZFS#Mail_notifications_(ZFS_Event_Daemon)
Secrets Configuration
This page follows the configuration defined in sops-nix, but you can use any secret managing scheme.
Add a "postfix/sasl_passwd" secret
Create an app password specifically for this postfix installation at https://myaccount.google.com/apppasswords (logged in as you).
You end up with a 16 character string separated by spaces. Put that in a sops secret:
nix-shell -p sops --run "sops /etc/nixos/sops-secrets.yaml"
Create this entry, using the 16 character string without spaces (Don't use the "abcdefghjklmnopq" string below. It won't work :-) ):
postfix:
sasl_passwd: '[smtp.gmail.com]:587 you@gmail.com:abcdefghjklmnopq'
Configure Postfix
sops.secrets."postfix/sasl_passwd".owner = config.services.postfix.user;
services.postfix = {
enable = true;
relayHost = "smtp.gmail.com";
relayPort = 587;
config = {
smtp_use_tls = "yes";
smtp_sasl_auth_enable = "yes";
smtp_sasl_security_options = "";
smtp_sasl_password_maps = "texthash:${config.sops.secrets."postfix/sasl_passwd".path}";
# optional: Forward mails to root (e.g. from cron jobs, smartd)
# to me privately and to my work email:
virtual_alias_maps = "inline:{ {root=you@work.example, you@home.example} }";
};
};
Profit
sudo nixos-rebuild switch
Send an email explicitly to you@gmail.com
nix-shell -p mailutils --run \ 'echo "This is a test email." | mail -s "Test Email from NixOS" you@gmail.com'
Send an email explicitly to root that gets sent to you@gmail.com and you@work.com (if you opted in for virtual_alias_maps)
nix-shell -p mailutils --run \ 'echo "This is a test email." | mail -s "Test Email from NixOS to root" root'
References
Porting my postfix gmail smtp to nixos on the NixOS Discourse.