[SOLVED] Error 554

[uxbod]

So locally you mean on the actual ZCS server itself ? This is weird as the only thing I have found is when SMTP command messages are out of sequence.

[joho]

No, sorry; locally I mean from my own machine, many miles away. I wanted to test "delivery" from a machine that wasn't the MF-appliance. But the result is the same.

[uxbod]

Can you try testing from the same network or even on the server itself ... On the perimeter is the traffic traversing a firewall/proxy or load balancer ?

[joho]

If I logon to the server and do the telnet session with localhost on port 25, the delivery works. Yes, it's behind a big*ss firewall :-)

[joho]

So basically, a valid summary of the situation is this:

Mail to the default domain works fine, from the outside and from the inside.

Mail to any other domain does not work from the outside, regardless of from where I connect or how I connect. Mail to these domains work fine from within Zimbra as well as from a telnet prompt ON the Zimbra machine.

I think the problem is within the Zimbra configuration for these domains and/or with postfix.

(Spam and virus filtering is disabled on Zimbra)

[joho]

I keep digging.. and am getting more and more confused.

If I enclose all addresses during the manual SMTP session within < and >, everything works (!).

[joho]

If I have spam/virus checks disabled, which program is responsible for doing recipient lookups, etc? I mean what is postfix configured to call to do the local delivery? Something in this chain returns "no", and thus Postfix fails. I can't find any other explanation.

[joho]

Well well well.. after a lot of digging, we found that a rule in the firewall caused this. SMTP ALG (Application Layer Gateway) was enabled, and the rule for Anti-SPAM, 'Deny emails with mismatching SMTP command "From" address and email header "From" address' was enabled.

I'm glad we got this sorted; but I'm confused as to why it works with the Zimbra default domain

Oh well.. on with the evaluation! Thanks for the help!