Mailbox unavailable. The server response was: access denied - invalid HELO name

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Hello friend,

having following error while sending mail with a specified domain in c# . Mailbox unavailable. The server response was: Access denied - Invalid HELO name (See RFC2821 4.1.1.1)

What I have tried:

Have you tried setting your auth credentials in the web.Config?

Posted 24-Feb-18 21:51pm

Promis Patel

Updated 25-Feb-18 1:19am

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#realJSOP · Answer 1 · 2018-02-25T00:39:00

Solution 1

The domain name for your SMTP server is incorrect.

Posted 25-Feb-18 0:39am

#realJSOP