List Mail User wrote:
>       tuxorama.com does a SMTP probe for every posting to this list
> and is one of the very few IPs I have firewalled off.  The probes seem
> to always come from 81.169.185.26 (now they'll probably change IPs and I'll
> have to block some other IP or range), so they, while irritating are very
> easy to block.  Asking them to stop seems to result in them stopping for
> a week or so, then beginning again.  They likely have one or more users
> who subscribe to this list.

It's almost certainly someone who uses milter-sender. milter-sender does this
dummy check before accepting mail. It's taking the "verify MX record of envelope
sender" one step further and verifying the whole address.

I personally find them rather inoffensive, but then again, I don't find many
things offensive that some of the right-wing admins go ballistic over.

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