In our network, we have na IBM Lotus Notes server, which handles emails for basedomain.com.

Recently we introduced a new IIS Smtp server just for sending automated emails. The Smtp is configured for a domain subdomain.basedomain.com. The server also has a DNS record for subdomain.basedomain.com

Sending emails outside of our network works fine, however it fails when we try to send an email to recipient@basedomain.com - the email returns with an 5.3.5 error.

We even tried the SMTPDiag tool to test the connection and it ended OK, it listed the correct end-server for email address recipient@basedomain.com.

Why doesnt it work when sending real email?

  • 1
    could you post the actual error message? – Str82DHeaD Sep 25 '13 at 11:21
  • The message just says 5.3.5 – Tomas Grosup Sep 25 '13 at 14:39

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