Anti-virus in a self-hosted server
Over the past 20 years, I've setup a lot of mail servers at work. These are mostly based on Postfix / Spamassassin / Dovecot, using IMAP for the clients. Recently, I started using Roundcube for webmail.
Postfix, uses several blacklists to block spam at the MTA level, these come pre-configured with the control panel, which blocks 99% of spam, and Spamassassin blocks the other 1%. Its a rare occurrence for spam to pass this setup, usually they are phishing emails or some new virus.
I always use DKIM, DMARC and SPF, and my deliverability is perfect, all mail goes to inbox.
I'm hosting mail servers with Linode and Hetzner, and I plan to expand to Netcup in the near future.
So far so good.
But, one thing I'm missing, is a good anti-malware/anti-virus, because ClamAV seems incapable of catching the malware files that go through my servers. I always take the time to extract these files and submit them at ClamAV Report Malware page, but its too late by then.
Sadly, when I submit the same virus to VirusTotal, the file gets 10+ hits in other anti-virus software but not ClamAV.
What are your suggestions?
Thank you.