503 error when sending email to external users

105 pts.
Tags:
Domino 8
Lotus Notes
I received the following message when sending email to external users but my Domino server did not block any outgoing email. Is this a Domino problem or external party email issues?

'503 This mail server requires authentication when attempting to send to a non-local e-mail address'

 



Software/Hardware used:
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  • Gabe9527
    Did it leave your servers? if it did then the recipient has a problem
    11,005 pointsBadges:
    report
  • Abushahd

    Is this the only email address you are having problem with ??

    Did you try to telnet this email address over port 25 ?

    4,040 pointsBadges:
    report

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