Hi everyone,
Does anyone have experience setting up email notifications for fail2ban?
I am trying to set sendmail MTA (mail transfer agent) to send an email with my gmail account when fail2ban bans an IP address but without success.
Any help is appreciated.

Do you try to use sendmail, or just an MTA compatible with sendmail?

In case of the former, I would suggest doing the latter.

@sbiewald I don't care as long as I make it work, sendmail or anything else. If you have something in mind that's is well documented and easy to use I will be thankful.

how about using a webhook?

there is this fail2ban webhook for slack you could adapt to sendmail maybe?
https://github.com/coleturner/...

@heyheni man this is awesome.
We don't use slack but I can adapt that for my purpose. Thanks a lot.

@waldz hmm while googling for that webhook i learned about ntopng network traffic monitoring tool. Looks interesting and it offers an integrated notification system for various server tools like fail2ban.

https://ntop.org/products/...

ntop alerts
https://ntop.org/guides/ntopng/...

@waldz In case you still want some mails:

- Postfix itself is well documented.
- If a "fully equipped" MTA is to much work, try mstmp. Just give it a username, password and server of an email account and you are done. On Debian/Ubuntu, install mstmp-mta for a sendmail compatible binary.