I use remote SMTP via nullmailer and it requires set From field to the specific name, but cron set it as email@example.com.
How could I change it to something like firstname.lastname@example.org?
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I don't think you can change the FROM address, (someone should add a MAILFROM option).
You can do something like this though to achieve a similar result:
* * * * * /path/to/script 2>&1 | mail -s "Output of /path/to/script" email@example.com -- -r "firstname.lastname@example.org" -F"Full Name of sender"
All output is piped to the mail command so the MAILTO variable isn't used at all.
The to address would need to be set but you may be able to use $MAILTO variable. The -- sets the rest of the options to be sendmail options so you can use the -r and and -F options.
-s is the subject
-r is the reply address
-F is the Full name of the sender (makes it look nice in email clients)
Modern versions of cron do accept "MAILFROM=..." in the crontab format. I suggest that you try "man 5 crontab". If it mentions MAILFROM, your version should support it. The phrase to look for is towards the end of the paragraph discussing MAILTO, and should be something like this:
If MAILFROM is defined (and non-empty), it will be used as the envelope sender address, otherwise, ''root'' will be used.
You can set the nullmailer from address via environment variables or command line. The command line arguments are
-F for sender address and full name respectively.
Usually you can set environment variables in the crontab.
NULLMAILER_USER=webmaster NULLMAILER_HOST=host.example.com NULLMAILER_NAME="Mr Cron" 5 0 * * * /usr/local/bin/daily.sh
See this question if using Exim:
It should set the "From" address to the cronjob owner's. You can replace
$header_from: with your custom address if you'd like to hard-code it to something else.
Another simple alternate is to use mutt,
create a .muttrc in the home directory of the user that runs cron with the following
set realname="Joe User" set from="user@host" set use_from=yes
Run a script with mutt command in it or pipe the cron command to mutt from to send email.
Before mutt sends and email, it will set the From header from the .muttrc file.
it is mailed from the user@domain -- the user is the login name the cron is running under -- so you'd have to create a user 'me' -- and run the cron job as that user.
Then to change the domain, there are different possibilities -- it could be that you need to change the hosts file entry (or, as on my machine, when I was configuring this -- an ubuntu box) -- change /etc/mailname -- to be the domain you want it to come from.