Для примера часть заголовка спам-письма:
Return-path: <
[email protected]>
Received: from halimedado.frinick.com ([195.209.38.170]:48124)
Received: from rev-net-0ckx-0165-01ip-01mklvki.mtb ([10.26.242.12])
by halimedado.frinick.com () with ESMTP id A7DD448911
X-ACL-Warn: Mark as SPAM because 195.209.38.170 is in a black list at dnsbl-1.uceprotect.net IP 195.209.38.170 is UCEPROTECT-Level 1 listed. See
http://www.uceprotect.net/rblcheck.php?ipr=195.209.38.170
X-ACL-Warn: WARN - The return address using for this email message <
[email protected]> does not seem to be a working account.
X-SpamTest-Info: {FROM: autogenerated email seems fake}
Спам-фильтры помогают, а что ещё?