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Limiting max recipients per email to 15

Posted: Wed Sep 09, 2020 3:17 am
by arktex54

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* [Feature] Limiting max recipients per email to 15, in order to prevent mass spamming
Looks like I found my problem I have been fighting for two weeks. How do I disable this?

I understand you do this for free and for your company and that is appreciated. Doing such things that breaks others installs is something that should be reviewed before implementing. Firefighters have not been receiving their pages because of this change.

Re: Limiting max recipients per email to 15

Posted: Wed Sep 09, 2020 10:01 am
by myVesta
Edit /etc/exim4/exim4.conf.template

Find:

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recipients_max = 15
recipients_max_reject = true
(should be around 28-29 line)

Delete both lines (or modify 15 to higher value).

Restart Exim4:

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service exim4 restart

Re: Limiting max recipients per email to 15

Posted: Wed Sep 09, 2020 10:14 am
by myVesta
I'm aware what problem this change caused, and I'm really sorry to hear that. I hope nobody is burned because of it.
Problem is that there is nothing to be 'reviewed', since this is not code change, this is just settings modification.

A lot of spammers (when they hack business users or site) uses this fact that nothing prevent them to put 500 email addresses per mail, and then to send spam.
We already have limit of 40 mails per hour, but when they put 500 addresses per mail, that limit will not prevent them to send 20.000 spam emails...

Re: Limiting max recipients per email to 15

Posted: Tue Sep 15, 2020 4:05 am
by arktex54
dpeca wrote: Wed Sep 09, 2020 10:01 am Edit /etc/exim4/exim4.conf.template

Find:

Code: Select all

recipients_max = 15
recipients_max_reject = true
(should be around 28-29 line)

Delete both lines (or modify 15 to higher value).

Restart Exim4:

Code: Select all

service exim4 restart
I was able to change it awhile back and came to give you thanks for the help!