msmtp comes with a couple of scripts called msmtpq and msmtp-queue that will queue mail locally if necessary.
https://sourceforge.net/p/msmtp/code/ci/master/tree/scripts/msmtpq/README.msmtpq I've been using them out of the Debian msmtp package, but I'd like to see them in Guix. Thoughts? Leo Famulari (1): gnu: msmtp: Install msmtpq. gnu/packages/mail.scm | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) -- 2.7.1