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Exchange reports not able to relay from it's own public address?????

Posted on 2008-06-23
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Last Modified: 2013-11-30
I have an exchange system that works for the most part, however, from time to time I get an NDR stating that it is unable to relay for the public IP address of the server.  Below I have posted the NDR that is received.  The public IP address is that of the exchange server as forwarded from the firewall.  Why would Exchange get this error when sending out its own public IP address?  Sometime I also get the error Not Local Host.

One Note on this is that I have a firewall with two internet connections.  I have MX records configured for both public IP addresses but the primary IP has a value of 10.  Should it not all ways use the mail record unless mail is not available and then go to ms1, and so on?  Could this be causing the relay error?

      'blj@brisbeeandstockton.com' on 6/23/2008 11:00 AM
            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator. <mail.validpublicdomain.com #5.5.0 smtp;550-mail.validpublicdomain.com [75.148.90.278] is currently not permitted to relay>

MX Records:

Non-authoritative answer:
validpublicdomain.com    MX preference = 10, mail exchanger = mail
validpublicdomain.com    MX preference = 20, mail exchanger = ms1.
validpublicdomain.com    MX preference = 30, mail exchanger = smtp

ms1.validpublicdomain.com        internet address = 64.65.189.278
smtp2.sea.eschelon.com  internet address = 209.150.200.18
mail.validpublicdomain.com       internet address = 75.148.90.278

Note I have changed the IP addresses to random numbers.
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Question by:exsabier
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Expert Comment

by:Chris Dent
ID: 21854879

Is this an inbound address blj@brisbeeandstockton.com?

The NDR you're getting shows "mail.validpublicdomain.com" as the MTA Reporting the error; For Relay Denied this is not the server that actually denies delivery, it's the hop after that. Is the next hop in your control? Or is delivery from there to a recipients server?

> Should it not all ways use the mail record unless mail is not available
> and then go to ms1, and so on?  

Yep

> Could this be causing the relay error?

Not for outbound mail. Perhaps for Inbound.

Chris
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Author Comment

by:exsabier
ID: 21859227
Thanks for the comment Chris.  The address blj@brisbeeandstockton.com is an outbound address.  That is an Exchange user of the "validpublicdomain.com" sent an e-mail to blj@brisbeeandstockton.com and the exchange server hosting "validpublicdomain.com" gives the error as follows:

There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator. <mail.validpublicdomain.com #5.5.0 smtp;550-mail.validpublicdomain.com [75.148.90.278] is currently not permitted to relay>

If you then resend the e-mail it goes through.  It is almost like the exchange server tries to relay through itself.
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Accepted Solution

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exsabier earned 0 total points
ID: 22422454
Well I never figured out why we continued to receive these messages but I set our server up to forward all outbound mail through our ISP's server and we have not had any issues since.

Can someone Please close this thread?
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