Member Avatar for Stu007

Hi,

I'm really hoping someone can help me with this problem:

I have a Mr Site email address, I'm trying to make it work with outlook 2007 and I'm using Sky Boradband. I can not or the life of me get it all to work happily. I've had various error messages but now I'm getting this error message as a reply email

Your message did not reach some or all of the intended recipients.

Subject: RE: XXXXXX
Sent: 03/07/2010 01:38

The following recipient(s) cannot be reached:

'XXXXXXXX XXXXXX' on 03/07/2010 01:39
503 This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server.

Please can someone give me some advice!!

Thanks!!

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  • Latest Post Latest Post by Lusiphur

Dani AI

Generated

Short summary and a practical checklist: the bounce shows the outgoing mail server is refusing to relay mail from the Outlook client until the client authenticates. is on the right track — Outlook must present valid SMTP credentials to the server. The checklist below gives exact Outlook 2007 steps and the common ISP/host causes to verify.

  1. In Outlook 2007 open Tools > Account Settings, double-click the account, click More Settings, open the Outgoing Server tab and check My outgoing server (SMTP) requires authentication. Select Use same settings as my incoming mail server (or enter the account username/password explicitly).
  2. Still in More Settings, open the Advanced tab. For the SMTP port try 587 first (submission/TLS), or 465 if the host requires SMTPS; avoid relying on port 25 if the ISP blocks it. Make sure the encryption setting matches the host’s recommendation (SSL/TLS when required).
  3. Confirm the SMTP username is the full email address and that the password is current. Test sending from the host’s webmail to rule out an account-level problem.
  4. If authentication and ports are correct but mail still fails, try the ISP’s SMTP as a diagnostic (some ISPs block outbound mail to third-party servers), temporarily disable any antivirus/SMTP scanning, and test again.

Notes and escalation: hosts often require authenticated relay or insist you use their SMTP hostname — ask MrSite for the exact SMTP server name, required port and encryption. When contacting MrSite or Sky support include the full bounce text, server names shown in the headers, and timestamps — that information speeds diagnosis. For , enabling SMTP authentication and trying port 587 will resolve this kind of 503/reject in the majority of cases.

Member Avatar for Lusiphur

For starters the error "503 This mail server requires authentication when attempting to send to a non-local e-mail address." generally indicates that you need to be using UN/PW authentication to log into the SMTP server to send email outside your own domain.

"Your message did not reach some or all of the intended recipients." can be caused by a number of issues ranging from mail servers rejecting the message due to untrusted mail server on your end to mail delivery issues in general.

Overall it sounds like the mail server simply wants you to log in before sending mail to outside recipients and that should solve the issue so change authentication setting on your SMTP server setting to include your account username and password and you should be fine.

That being said... I fail to see how an issue with a 3rd party mail service not working in Outlook 2007 has anything at all to do with ASP.Net lol :P

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