Le mercredi 18 août 2010 à 13:39 -0400, Joseph Brennan a écrit : > The error message from Barracuda is broken too. Sample: > > > > ... while talking to barracuda.xprize.org.: > >>>> DATA > > <<< 554 Service unavailable; Client host [tarap.cc.columbia.edu] blocked > > using Barracuda Reputation; > > http://www.barracudanetworks.com/reputation/?r=1&ip=69.86.203.182 > > 554 5.0.0 Service unavailable > > > That says our outbound mail server tarap is blocked, right? > > But wait, the URL says 69.86.203.182 is blocked. That's not us. That's > user-12lditm.cable.mindspring.com. One of our users was there, did SMTP > auth to our server tarap, and we allowed the message. >
You got it Joseph... the sending server has an ip not listed in the bl, but relayed form an ip which is listed. As a result barracuda rejected the mail because of blacklist: this is deep scanning. an Obviously non-standard and stupid behaviour.... because primarily bots sending spam, send direct to MX, or via a spam canon (which has to be listed). If an barracuda blacklisted IP relays through an non listed server (even more if it uses auth/TLS) they are many chances the mail is legitmate and so no reason to reject it! > 69.86.203.182 is still listed. Go to the URL. It does not tell you why > but suggests many possible reasons. I'd go for the last one :-) > I suscpect many barracuda admin not to understand how to use this feature! > > Joseph Brennan > Columbia University Information Technology > >
