Problem using a 3rd Party SMTP and delivering email locally

[Peter Downes]

Hello Forum

We very recently changed our VPS Host Name from the default to mail.ourdomain.com.

With my PC's SMTP set to
--
mail.ourdomain.com
--
I can send to ANY email account.


If I change my SMTP to a third party SMTP server (eg BT or Orange) I CANNOT send to accounts on our VPS or our VPS provider's network. But I CAN send to all others.


The bounce error is along these lines
(BTW I am certain [email protected] is good address):

--
The following addresses had permanent delivery errors: [email protected]

Reporting-MTA: dns; c2beaomr08.btconnect.com
Arrival-Date: Tue, 5 Apr 2016 14:03:14 +0100
Final-Recipient: RFC822; [email protected]
Action: failed
Status: 5.2.0
Remote-MTA: DNS; mail.testdomains.co.uk
Diagnostic-Code: SMTP; 550 5.7.1 Command rejected
--

I wonder if this problem is to do with the Host Name change or something else?
Would be grateful for advice on where to start troubleshooting.

Many Thanks

 

[UFHH01]

Hi Peter Downes,

The bounce error is along these lines
(BTW I am certain [email protected] is good address):

Result:

[001.199] ~~> RCPT TO:<[email protected]>
[001.401] <~~ 550 unknown user
[001.401] Cannot proof e-mail address (reason: RCPT TO rejected)

Please test it with another mail - adress, which is actually EXISTENT.

 

[Peter Downes]

Thanks @UFHH01

Sorrry. Perhaps a misunderstanding? I didn't want to publish the genuine sending and receiving email addresses on the post.

So for [email protected] please read pete@john******itects.com - real address with mail box etc.

Hope that clear

 

[UFHH01]

Hi Peter Downes,

please be reminded, that investigations are pretty tough, just by "guessing" ( which is due to the case, that you want to keep most of your information "anonymous" ). People willing to help you have to get some decent informations, because otherwise the possibilities can vary from "not the case", to "not relevant" and therefore suggestions/solutions could be pretty useless, because they may not suit your issue(s).

 

[Peter Downes]

Very Sorry @UFHH01. I didn't mean to waste your time.