Mail problems

  billy8 21:25 24 May 06

I am having problems getting through to an e-mail address that was ok a few days ago.

I still receive e-mails from this address but when I reply I get this report:

"Reporting-MTA: dns;
X-SMTP-Server-Queue-ID: E4F26480658D
X-SMTP-Server-Sender: rfc822; b**********************.uk
Arrival-Date: Sun, 21 May 2006 16:18:42 +0200 (CEST)

Final-Recipient: rfc822; bemad@*********.net
Action: failed
Status: 4.0.0
Diagnostic-Code: X-SMTP-Server; delivery temporarily suspended: host
mx00.mail.*********.net[] refused to talk to me: 421 Service
not available"

Anyone suggest what the problem might be?

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