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crowdsec
CrowdSec - the open-source and participative security solution offering crowdsourced protection against malicious IPs and access to the most advanced real-world CTI.
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I would say it depends on your threat analysis. If you’re afraid of anyone abusing your sendmail for spamming purposes I would say that you’re good to go. If you want to protect it towards a number of other threats, exploiting and god knows what you need something else, for instance CrowdSec which is a modern version of f2b using crowdsourced threat intelligence (and being way more advanced). Parsing postfix logs are supported out of the box (spammers are detected too) - so is blocking abuse via the host firewall on Linux and FreeBSD. Disclaimer: I am head of community at CrowdSec and an avid user myself. If you’re interested and wants to know more, please let me know. I’ll be more than happy to help you out in any way I can.