Error in establishing SMTP connection, Error: 504 5.7.4 Unrecognized authentication type

  • Thread starter DanieleS
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DanieleS

Hi

We have a 3rd party product that sends SMTP commands to the mail server. We are currently migrating from Exchange 2003 to 2010.

The product works fine with 2003, but sending the same information to 2010, produces " Error in establishing SMTP connection, Error: 504 5.7.4 Unrecognized authentication type" . This is followed by " Error: 550 5.7.1 Unable to relay"

Our IT people are at a loss and as I am not an exchange specialist (just a humble accountant actually) I was wondering if anyone had come across a solution that doesn't involve setting the exchange server to allow relaying?

Thanks
 
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Anil K Singh

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Mike Crowley

Exchange 2010 does not allow inbound unauthenticated mail by default. This applies to All mail, not just mail from your application. This is because Microsoft expects you to use an Edge Transport server. Because you are not, you need to adjust your default receive connector to allow " anonymous" . This will allow inbound mail and will not make you an open relay.

See this article for more:

http://msexchangeteam.com/archive/2006/11/17/431555.aspx (says 2007, but same for 2010)

Mike Crowley
Check out My Blog!
 
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Mike Crowley

That may seem like the obvious answer here, as it is what Anil stated as well, but if the emails are destined for internal exchange recipients this is not necessary or advised. This type of dedicated connector is only required when an appliance needs to use Exchange to send to the internet.

Mike Crowley
Check out My Blog!
 
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