WOW, did our email filters ever mangle that one!  For etc/postfix/ (long URL) 
the (long URL) should have been main <dot>cf.  I have no idea what triggered 
that one...

________________________________
From: ubuntu-server <[email protected]> on behalf of Leroy 
Tennison <[email protected]>
Sent: Friday, August 16, 2019 3:49:27 PM
To: [email protected] <[email protected]>
Subject: Re: Updated cron?

Just a quick update for anyone facing a similar situation and finding this: 
Postfix does have a way to do this through a feature called "smtp generic maps" 
and it's easy:

Create /etc/postfix/generic with, or example: root@<contents of /etc/mailname>  
 <some valid email address> (one "mapping" per line)
Run postmap hash:generic
Add "smtp_generic_maps = hash:/etc/postfix/generic" to 
/etc/postfix/https://linkprotect.cudasvc.com/url?a=https%3a%2f%2fmain.cf&c=E,1,58-sIIlBpdTZrI2-IKZwOBCs_twYiICKAaJClTgl8qYzLgGv-kDTPTKugVySCIiT_cOusTEToOmnw-U92EIBp2b9NDFVUDyczOxlKbeIVOX33YRwQboR8Q,,&typo=1
Restart Postfix



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-----Original Message-----
From: Robie Basak <[email protected]>
Sent: Tuesday, August 13, 2019 10:45 AM
To: Leroy Tennison <[email protected]>
Cc: [email protected]
Subject: [EXTERNAL] Re: Updated cron?

On Tue, Aug 13, 2019 at 02:04:14PM +0000, Leroy Tennison wrote:
> I don't know about a specification but, from "man 5 crontab" on
> OpenSUSE 13.2 'If MAILFROM is defined (and non-empty), it is used as
> the envelope sender address, otherwise, "root" is used.

Sounds like it is using "sendmail -f <MAILFROM>".

Thank you for bringing this up Leroy. I thought I'd share my thoughts on what 
we should be doing generally in Ubuntu, rather than in answer to your specific 
question:

I have no particular objection to tweaking cron, but:

 1) it does seem to me that if users find MAILFROM necessary, then they  would 
be better served by being advised to tweak their MTA  configuration rather than 
hoping for a similar feature in every email  sending app and configuring each 
app individually.

 2) perhaps it's better to leave cron as-is for legacy purposes, but  advise 
that users look at newer tools that don't have a backward  compatibility burden 
for additional functionality (eg. systemd timers).

If there is clearly a leading cron compatible replacement in wide use in the 
community then switching to that might make sense, but it would need someone to 
take the ongoing effort to make sure that we don't break any existing users 
currently happy with the current cron implementation.

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