CentOS 7 sending e-mail crons while sendmail is not installed

Question

Background

I have configured my crontab to send me emails that way

MAILTO=myemail@company.com
...

And I am receiving the e-mail in myemail@company.com's inbox through the company SMTP server without having to configure anyting. (They do not require authentication if you send an e-mail from the company's network a company e-mail address).

The server is linked to our Windows active directory through Kerberos and Samba, if this is of any help to diagnose the issue.

The issue

I want to edit the e-mail settings because I need to authenticate to the SMTP to be able to send the cron e-mails on non-company e-mails.

What I've tried already

After a quick look on google, I've found this question. Problem: Sendmail is not installed on the server and there is nothing related to e-mail configuration in /etc/sysconfig/crond.

What else can I do to figure out what is used to send e-mails from crond and how to configure it ?

I do have postfix installed, does crond falls back to postfix if sendmail is not installed ? — Noah Boegli, Feb 14 '20 at 07:04
@NoahBoegli, both `sendmail` and `postfix` are MTA so they can deliver mail. If you set `postfix` not to listen it can be used to deliver locally and forward the mail. — Romeo Ninov, Feb 14 '20 at 08:25
The source code of the message may have `Received` headers pointing the name of the mail transfer agent. Have you looked into it? — Anderson Medeiros Gomes, Feb 14 '20 at 13:22
I hadn't thought of looking in here. It says postifx. Thanks to all of you for helping me figuring this out! — Noah Boegli, Feb 14 '20 at 14:43

score 1 · Accepted Answer · answered Feb 14 '20 at 14:45

1

The solution

Looking into the headers of the e-mail, there was a small line mentionning postfix.

Furthermore, I could have directly thought of looking for postfix when I found out that sendmail was not installed.

Conclusion: Next time I'll double check e-mail headers before posting.

answered Feb 14 '20 at 14:45

Noah Boegli

111
4

This is a typical RTFM (read the fine mail) solution. +1 – Archemar Feb 14 '20 at 17:04

CentOS 7 sending e-mail crons while sendmail is not installed

Background

The issue

What I've tried already

1 Answers1

The solution