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SO: Ubuntu 18.04.6 Postfix: 3.3.0 GNUmailutils 3.4

I've a script that send email to office/outlook user. If I start script from terminal, email arrive correctly to user. If i set same script on crontab, email arrive to user but is signed by MS with "Some people who have received this message do not often receive e-mails from " How can I solve?

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  • Hello. A good start to solving any problem is to have correct info. There is no such version of Ubuntu as 18
    – David DE
    Commented Apr 13, 2022 at 14:50
  • Could you describe more specifically what is the actual problem?
    – raj
    Commented Apr 13, 2022 at 14:56
  • If start script from terminal mail arrive correctly. If I use crontab to start script mail arrive but MS outlook signed with message ""Some people who have received this message do not often receive e-mails from " I search online and I read that is an antiphishing protection.
    – paoloD77
    Commented Apr 13, 2022 at 15:12
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    I suspect it's something to do with differences in the mail header that trigger the recipient's mail filters (for example, the originator appearing to be root@localhost or somesuch). But to have any hope of answering this, you'll need to provide much more detail - how does your script send email? what MTA are you using, and how is it configured (particularly any reverse aliases)? Whose crontab are you running the script from?
    – steeldriver
    Commented Apr 13, 2022 at 17:31
  • What is the sender of the e-mail that you send directly from terminal and what is the sender of the e-mail sent from crontab? View full exact headers of both emails and try to find differences. These differences are the reason for the Outlook message you quote.
    – raj
    Commented Apr 13, 2022 at 18:58

1 Answer 1

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Jobs run through cron aren't run in the same runtime environment that you have on your desktop. None of your PATH changes, or other environment variable settings from ~/.bashrc are automatically propagated to your cron job. For example, there's no $DISPLAY, so GUI programs need special treatment (read man xhost).

One can set environment variables for all one's cron jobs in the crontab file Read man 5 crontab.

Look at the results of echo "=== id ===";id;echo "=== set ===";set;echo "=== env ===";env | sort;echo "=== alias ===";alias in each of your environments.

Since the command part of the crontab line is, by default, interpreted by /bin/sh, which has a simpler syntax than /bin/bash, I recommend having command be a call to a bash script (executable, mounted, starts with #!/bin/bash) which sets up the environment, then calls the desired program.

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  • Script is executable, start with #!/bin/bash Example: #!/bin/bash echo -e "From:USER@THIS_SERVER\nTo: EXTERNAL_USER@OUTLOOK\nSubject: TEST\n\n BODYTEST " | sendmail -t
    – paoloD77
    Commented Apr 14, 2022 at 10:35

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