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Exchange email issue: #5.5.0 smtp;550 <*****@goran-ando.com>... Relaying denied

BigZWillis asked
Last Modified: 2009-12-16
When anyone from my domain tryings to send to the goran-ando.com domain, intermittently (maybe 1 in 5), we will get a return back saying "There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator. <ourmailserver #5.5.0 smtp;550 <*****@goran-ando.com>... Relaying denied>".

A little about my exchange environment:
- 1 exchange sever
- No connectors
- PTR, MX, DNS, everything is setup corrently and verified using DNSstuff
- Running TrendMicro Message Scan which has already been ruled out as a issue

I also checked with the host of goran-ando.com and they claim nothing is wrong on their side. However, MessageLabs (goran-ando.com) has more than one server. Is it possible that just one of their servers has a problem with our domain?

Any ideas how to fix this if it is on our side, if it is infact on our side? It's a big problem because he actually works for my company but is still keeping his outside email address. Thanks.
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Nice! Great suggstion. I am going to try that and I will get back to you. Thanks.


From DNSstuff when I asked for the MX record for goran-ando.com

goran-ando.com. MX IN 300 cluster3.eu.messagelabs.com. [Preference = 10]
goran-ando.com. MX IN 300 cluster3a.eu.messagelabs.com. [Preference = 20]

So it's using cluster3 and cluster3a if 3 is down... When I telnet to them I get server9 for cluster3 and server10 for cluster3a. I can send no problem with server9 but cannot send through server10. Can someone else please try this? See if it's my server or just server10 in general. The address to test to is goran@goran-ando.com.
I tried some didn't get a failure though i did have to comply with this article with including the subject


However it seems there may be more than one server10! what was the tower number?



Yeah I think you are right... I just got server-10.tower-531... Wish I would have documented the one I was getting an error on. I'll keep trying... Thanks.

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