Tag Archives: IIS

Helo command rejected: need fully-qualified hostname when sending emails (504)

Simple tip this afternoon. You may have got the following error when sending emails through ASP.Net’s built in mail server before: From: postmaster@YourWebserversName [mailto:postmaster@YourWebserversName] Sent: 29 June 2012 15:50 To: sender@sendingdomainname.com Subject: Delivery Status Notification (Failure) This is an automatically … Continue reading

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