Le 18/09/2022 à 00:32, Greg Wooledge a écrit :
On Sat, Sep 17, 2022 at 11:11:51PM +0200, Yvan Masson wrote:My question is: how cron daemon and mail command know that they should contact openSMTPd, and how? Do they try by default on localhost:25 or /run/smtpd.sock? I could not find any clue, nor in cron manpages nor in mailutils online documentation.mail(1) or mailx(1) or similar utilities run the /usr/sbin/sendmail program to inject a new message into the local MTA. /usr/sbin/sendmail was of course originally provided by the sendmail package. But later MTAs implement a /usr/sbin/sendmail compatible wrapper so that all the utilities that send mail don't have to change.
Thanks Greg!Indeed, just to confirm for other interested on this topic, this is documented for `mail` command on https://mailutils.org/manual/mailutils.html#Mail-Variables, and for Vixie/ISC cron (default cron daemon on Debian) on https://salsa.debian.org/debian/cron/-/blob/master/config.h.
So the `mailutils` package with `mail` command is optional: `sendmail` could be used directly in scripts (but it might be a bit less practical to use, see for example https://www.computerhope.com/unix/usendmai.htm#examples).
Regards, Yvan
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