clamsmtp - 1.10-17.2 main

ClamSMTP is an SMTP proxy daemon that checks for viruses using the ClamAV
anti-virus software. It can act as a traditional SMTP proxy with publicly
accessible ports or as a transparent proxy, where SMTP traffic is redirected
to the ClamSMTP by your router.
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ClamSMTP aims to be lightweight, reliable, and simple rather than have a
myriad of options. It is written in C without major dependencies. ClamSMTP
does not do general spam filtering, it only scans for viruses.
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You do not need a local mail-transport-agent installed, since this server can
forward to a remote one.