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We have been using postfix and exim on different servers. Now it may be the time to switch to opensmtpd as it is modern, secure and easier to configure. Guix comes with a default opensmtp service, so let's try and get that running as a system container for reasons of deployment. See also
Setting up a mail service with Guix is described in
https://guix.gnu.org/en/manual/devel/en/html_node/Mail-Services.html
A service is defined as
(service opensmtpd-service-type
(opensmtpd-configuration
(config-file (local-file "./my-smtpd.conf"))))
A first attempt at running a container is
(use-modules (gnu)
(gnu services mail))
(operating-system
(host-name "mail")
(timezone "UTC")
(locale "en_US.utf8")
(bootloader (bootloader-configuration
(bootloader grub-bootloader)
(targets (list "/dev/sdX"))))
(file-systems %base-file-systems)
(users %base-user-accounts)
(packages %base-packages)
(services (cons
(service opensmtpd-service-type
(opensmtpd-configuration
(config-file %default-opensmtpd-config-file
; (config-file (local-file "./my-smtpd.conf")))
)))
%base-services)))
Running
guix system container opensmtpd.scm /gnu/store/n6ap881jp3lgms35z0dyw4mnkkqsnm89-run-container
creates a container file that can be started with the returned launcher, e.g. as root
/gnu/store/n6ap881jp3lgms35z0dyw4mnkkqsnm89-run-container