Mail rejected. Error - "You do not have permission to send to this recipient".

Posted on 2007-03-20
Last Modified: 2009-02-08
I get the following error message when sending from to on 3/20/2007 9:23 AM
  You do not have permission to send to this recipient. For assistance, contact your system administrator.
  < #5.7.1 smtp;550 5.7.1 Client host rejected: cannot find your hostname, []>

I think my PTR record is ok:

> dig -x

; <<>> DiG 8.3 <<>> -x
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 3
;;, type = ANY, class = IN

;; ANSWER SECTION:  23h48m52s IN PTR

;; AUTHORITY SECTION:   23h48m52s IN NS   23h48m52s IN NS   23h48m52s IN NS

;; ADDITIONAL SECTION:         6h57m46s IN A         6h57m46s IN A         6h57m46s IN A

....though the hostname of is worrisome. Don't know where that comes from. Ideas?
Question by:8eindustrial
  • 2

Expert Comment

ID: 18756560
Follow the below technet article for the error code that you are getting .

LVL 104

Expert Comment

ID: 18760651
The is what your server is announcing itself as.
That name resolves to your IP address.

However the reverse DNS doesn't match.

The reverse DNS comes back as which forward reverses to

Therefore it looks like you have either got your firewall config wrong so the traffic appears to come out from the wrong IP address, or the server as an identity crisis.


Author Comment

ID: 18762816
I changed the virtual smtp server settings which had configured. Now I'm getting the following message. I did this yesterday afternoon around 3p so if there was anything to propagate we should have been all set. on 3/21/2007 6:38 AM
  You do not have permission to send to this recipient.  For assistance, contact your system administrator.
  < #5.7.1 smtp;550 5.7.1 Client host rejected: cannot find your hostname, []>
LVL 104

Accepted Solution

Sembee earned 500 total points
ID: 18767913
You need to look at the firewall. is resolving to, whereas it would appear that the Exchange server traffic is coming out as


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