hm, tried to test that, but opensmtpd is called smtpd on debian. Not sure how to handle that.
@weiss, @waja : Any ideas?

hm, tried to test that, but opensmtpd is called smtpd on debian. Not sure how to handle that.

What's the question about the "name" of opensmtpd in debian? You need a running opensmtpd for tesing?

Sorry, that was in its shortness rather confusing. The binary itself is smtp not opensmtp. So, this is probably not OS independent. What would be the best way to circumvent that?

looking into the documentation, it indicates that the binary is smptd. In Debian for example there is only one software with smtpd in the search path, opensmtpd. See https://packages.debian.org/search?mode=path&suite=bullseye&section=all&arch=any&searchon=contents&keywords=bin%2Fsmtpd

Searching on the net around the binary seems even on FreeBSD smtpd:

• https://calomel.org/opensmtpd.html
• https://freebsd.pkgs.org/13/freebsd-aarch64/opensmtpd-6.8.0,1.pkg.html

So maybe the option should be better "smtpd" instead of "opensmtpd"? It just sounds a bit to generic, that @Subito used "opensmtpd" as option for -M (--mailserver) but didn't had in mind, that this is autodetected if this option is not used?

hm, I should have taken a look at FreeBSD too then. I guess, with the change from opensmtpd to smtpd we should be fine, then.

hopefully. I think we should somewhere (prominent) document, that smtpd stands explicitly for OpenSMTPD.