vanderhaags
asked on
Exchange 2010 Bouncing 5.5.0 SMTP Permanet Failure Mailbox Unavailable
We are getting a very strange bounce off a valid email address, from a company who can send to other people on our domain. The person cannot send in to us and receives back this error:
"There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<messaging.asdf.com #5.5.0 smtp:550 permanent failure for one or more recipients (asdf@asdf.com:550 Requested action not taken: mailbox unavailable)>"
I have searched and searched to no avail, it just confuses me why it would happen on 1 person and they can send to other people within our company. Our Barracuda shows it Action: Allowed Delivery Status: Rejected (mail.vanderhaags.com:550 Requested action not taken: mailbox unavailable)... so it is going past the spam filter and being bounced on our Exchange 2010 server.
"There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<messaging.asdf.com #5.5.0 smtp:550 permanent failure for one or more recipients (asdf@asdf.com:550 Requested action not taken: mailbox unavailable)>"
I have searched and searched to no avail, it just confuses me why it would happen on 1 person and they can send to other people within our company. Our Barracuda shows it Action: Allowed Delivery Status: Rejected (mail.vanderhaags.com:550 Requested action not taken: mailbox unavailable)... so it is going past the spam filter and being bounced on our Exchange 2010 server.
Check the mailbox does not have restrictions on who can send to it.
Whats does exchange message tracking logs show.
ASKER
The local user has no problems sending to anyone, nor does the external person, except to 1 person. I believe it has to do with the SPF or rDNS because we have hosted DNS on Amazon with a hosted spam filter on Barracuda. I believe it is on the senders end trying to prevalidate the email. I guess I am not sure exactly how to setup SPF TXT on our Amazon for Barracuda, they say "We don't support DNS" I was like you are providing a service of spam filtering if this is a common issue then I think you should consider informing people of this scenario especially if good email is getting blocked, dur.
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Can you send to the mailbox from a gmail/hotmail account?
Can other people in this external company email this mailbox?
More details would be helpfull.
What have you already tested to diagnose?