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Exchange 2007 error 550 5.7.1 Unable to relay

Exchange 2007 error 550 5.7.1 Unable to relay

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  #1  
Old 10th March 2008, 21:42
John777 John777 is offline
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Default Exchange 2007 error 550 5.7.1 Unable to relay

My setup:
Single 2003 domain, two exchange 2007 SP1 servers, one is HUB/CAS another HUB/MAIL. Clients – Outlook 2003 SP2

Some of our users will get this error as they try sending an email to multiple external recipients.
Detailed NDR is below:

#550 5.7.1 Unable to relay - reinject host refused rcpt to: - psmtp ##

“Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator”.

I have no email policies setup other then the default one. We also use a smarthost for outbound mailings and no filtering is done. Checked my domain for blacklisting – OK, checked for Open relay – OK.

Any suggestions?
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  #2  
Old 12th March 2008, 02:39
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Default Re: Exchange 2007 error 550 5.7.1 Unable to relay

Whose smart host do you use? The error looks like one generated by Postini. It isn't an Exchange message so is happening from outside the server.

Simon.
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  #3  
Old 12th March 2008, 19:32
John777 John777 is offline
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Default Re: Exchange 2007 error 550 5.7.1 Unable to relay

You are right - it is Postini. I have talked to them and they were saying that this has to be something on my exchange server. Not sure what could it be...
Any ideas?
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  #4  
Old 12th March 2008, 23:12
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Default Re: Exchange 2007 error 550 5.7.1 Unable to relay

Do you route inbound email through another host or anything like that? Scan email using an appliance?

Simon.
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Old 13th March 2008, 00:42
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Default Re: Exchange 2007 error 550 5.7.1 Unable to relay

No, I do not route inbound email thru another host nor using an appliance to scan it.
Could it be because my outgoing and incomming IP's are different, because of the use of smart host?

Does it make any sense? have not had this issue while were on 2003 exchange.
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  #6  
Old 13th March 2008, 02:20
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Default Re: Exchange 2007 error 550 5.7.1 Unable to relay

If your IP addresses are different then that could be causing a problem. One antispam technique is to call back to the IP address connecting to confirm that it is an SMTP server. A bot wouldn't respond. Therefore if you have incoming SMTP traffic coming in another way then that test would fail.

Simon.
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  #7  
Old 13th March 2008, 19:17
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Default Re: Exchange 2007 error 550 5.7.1 Unable to relay

Thanks Sembee. I will have to look into this more further, and see if there is anything that could be done to correct this.
Also found some documentation on Postini's site in regards of message reinjection. See below...

The reinjection host must be configured to allow the message security service IP
addresses to relay for external recipients. You may have already set up your mail
server and firewall to accept messages from the message security service, but
reinjection requires further access. Your reinjection server must accept mail from
the message security service and send it out again. This is called a private relay.

Do you think I should consider configuring my exchange as a reinjection server also?
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  #8  
Old 13th March 2008, 22:19
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Default Re: Exchange 2007 error 550 5.7.1 Unable to relay

I haven't had anything to do with Postini, so cannot comment on their requirements for their service.

Simon.
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  #9  
Old 13th March 2008, 23:37
John777 John777 is offline
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Default Re: Exchange 2007 error 550 5.7.1 Unable to relay

fair enough...
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