MAILFROM should probably substitute variables

[lkraav]

#17 (comment)

Because hardened mail servers will refuse to accept mail without authentication, it would make sense to provide MAILFROM with the ability to substitute at least $USER variable.

Global configuration MAILFROM=cron+$USER@server resulting in cron+maria@server e-mail would be more clear than just cron@server.

[t8m]

PRs welcome

[lkraav]

My personal C-fu is definitely not strong enough to get this done anywhere near "quickly". Have to look into outsourcing.

[thisHermit]

I am interested in working on it. Is it still relevant?

[lkraav]

I am interested in working on it. Is it still relevant?

I'm definitely still interested in reaching this feature.

[thisHermit]

Hi @lkraav. I am a bit new to open source. So I didn't understand what you mean.

Do you intend to work on it or are you encouraging me to work on it?

[lkraav]

Ecnouraging you. I'm still very weak at C, as all my time is spent in scripting languages.

[fcappi]

Hi, as @lkraav I'm also interested in this feature.

@thisHermit are you still willing to work on this? If not, let me know and I can go ahead and implement it.

Thanks!

[thisHermit]

Go ahead.

[fcappi]

Hi,

Now you can use environment variables(Using ${} or $ format) as part of MAILFROM and MAILTO. See the example below.

Environment variable:

[root@4e02e521cbe0 /]# env
HOSTNAME=4e02e521cbe0

crontab:

[root@4e02e521cbe0 /]# crontab -l
MAILTO=root-mailto@${HOSTNAME}
MAILFROM=root-mailfrom@$HOSTNAME
* * * * * /bin/bash /development/cronie/test.sh

Email sent by cron:

b'From: "(Cron Daemon)" <root-mailfrom@4e02e521cbe0>'
b'To: root-mailto@4e02e521cbe0'
b'Subject: Cron <root@4e02e521cbe0> echo "$(date)" >> /development/cronie/output.txt'

The feature should be included on next package release. For now, you have to build the code from master branch.