SMTP relay tests

[pmsac <pmsac () camoes rnl ist utl pt>]

        Hello,

        In the company I work for, I'm getting, from time to time,
        mails from something like FROM:xpto@domain RCPT:relaytest@domain.
        Namely, I got this test originating @manawatu.co.nz, which tested
        thouroughly,  with empty sender, uucp style, et al...

        What are these people motivations ? E-Commerce spamming ?
        Trying to get some kind of anonimity ? It's starting to get
        on my nerves.

        --
        Cavaca, P.
        pmsac () camoes rnl ist utl pt