Postfix for Gmail - Revision history

Tie-ling: msmtp

2025-09-18T21:44:41Z

msmtp

← Older revision		Revision as of 21:44, 18 September 2025
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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 ==		== Secrets Configuration ==

Gileri: /* Configure Postfix */ Use explicit example email address to prevent possible leaks

2025-07-26T05:09:19Z

Configure Postfix: Use explicit example email address to prevent possible leaks

← Older revision		Revision as of 05:09, 26 July 2025
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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@~~gmail~~.~~com~~, you@~~work~~.~~com~~} }";		virtual_alias_maps = "inline:{ {root=you@work.example, you@home.example} }";
	};		};
	};		};

SigmaSquadron: Cleanup for the secrets configuration, improved references formatting.

2025-02-23T17:27:00Z

Cleanup for the secrets configuration, improved references formatting.

← Older revision		Revision as of 17:27, 23 February 2025
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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.

	== ~~Setup sops-nix~~ ==		== Secrets Configuration ==

	~~Follow~~ https://github.com/Mic92/sops-nix		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]].

	~~Make sure~~ you can ~~create secrets in /run/secrets before continuing~~.

	== Add a "postfix/sasl_passwd" secret ==		== Add a "postfix/sasl_passwd" secret ==
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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'

	== ~~Source / Credit~~ ==		== References ==

	~~This post came out of this~~ [https://discourse.nixos.org/t/porting-my-postfix-gmail-smtp-to-nixos/30286 ~~discussion~~].		[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 Server]]		[[Category:Mail Server]]
	[[Category:Server]]		[[Category:Server]]

Klinger: Category:Mail Server Category:Server

2024-04-24T19:53:29Z

Category:Mail Server Category:Server

← Older revision		Revision as of 19:53, 24 April 2024
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	[[Category:Mail ~~servers~~]]		[[Category:Mail Server]]
	[[Category:Server]]		[[Category:Server]]

Klinger at 19:52, 24 April 2024

2024-04-24T19:52:09Z

← Older revision		Revision as of 19:52, 24 April 2024
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	This post came out of this [https://discourse.nixos.org/t/porting-my-postfix-gmail-smtp-to-nixos/30286 discussion].		This post came out of this [https://discourse.nixos.org/t/porting-my-postfix-gmail-smtp-to-nixos/30286 discussion].


			[[Category:Mail servers]]
			[[Category:Server]]

Mic92: imported from old wiki

2024-04-23T15:18:30Z

imported from old wiki

New page

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.

== Setup sops-nix ==

Follow https://github.com/Mic92/sops-nix

Make sure you can create secrets in /run/secrets before continuing.

== 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@gmail.com, you@work.com} }";
};
};

== 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'

== Source / Credit ==

This post came out of this [https://discourse.nixos.org/t/porting-my-postfix-gmail-smtp-to-nixos/30286 discussion].