These, it seems, are outgoing packets. Why, then, have they got those source
addresses? Is someone managing to bounce packets through my mail server to
hide their tracks?
I've never seen many of these, just the occasional one. Sometimes they seem
to relate to an ntp source. Often they seem to come from a university site.
I think the fact that I don't see many means that I'm not being used as an
open relay, but I'm not 100% confident of that. I'd like to understand
what's happening.
open relay is not to so with IMAP - thats SMTP
if this is an issue rather than just forwarding the ports setup an
openvpn server on your LAN machine access your LAN using the VPN.
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