On Thursday, December 15, 2011 at 21:41:51 UTC, bjloc...@lockie.ca confabulated:

> I run my own domain off a dynamic IP but all my postfix uses relayhost set to 
> smtp.myisp.
> This works 99.9% of the time but I have encountered two recipients
> who use Barracuda's that block email from my domain.

> The bounce includes "(reason: 554 Service unavailable; Client host
> [smtp.myisp] blocked using Barracuda Reputation;
> http://bbl.barracudacentral.com/q.cgi?ip=mydomainIP)".

> The Barracuda is looking at the sender IP (mydomainIP) instead of the 
> relayhost IP.

> Is there another way to run a mailserver?

> Is there a standard I can read?

My  guess,  whoever  is  running  the Barracuda appliance has the deep
header parsing option turned on and should turn it off.

-- 
If at first you don't succeed, so much for skydiving.

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