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{ Tag Archives } Postfix

Helo command rejected: Host not found

Aus dem Logfile unseres Firmen-MTAs:
reject: RCPT from gw01.zanox.com[217.110.111.101]: 554 <z-de-dom02.zanox.com>: Helo command rejected: Host not found; from=<XXXXXX@zanox.com> to=<YYYYYYY>
Schon erstaunlich wie sich solch große Firmen wie Zanox solche Anfängerfehler Schnitzer leisten.
Wie liefern die überhaupt irgendwo Emails ein?

Also tagged Arbeit, DNS, Email, Netzwerk
2010 05 31 Comments (4)

Facebooks mailserver listed in SPAMCOP, ix.dnsbl.manitu.net, mails looking fishy

This is going to be a little bit technical.
User enters ********@ks-webstyle.de on facebook register form. Facebook checks if entered address can receive mail.
Postfix does sender verification (reject_unverified_sender), policyd-weight checks DNS, RBLs and some other stuff.
69.63.178.167 is listed in ix.dnsbl.manitu.net, oops! Overall rated as spam since some checks made this email look fishy:

Also tagged Facebook, Greylisting, SPAM
2010 05 07 Comments (8)