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Aragorn · 07-08-2007, 13:21

According to this page, error 421 is 'Command not available'! eg Outlook might be trying to use an SMTP feature not on the ntlworld server!!

Try pulling up a command prompt ('Start','Run', "cmd") and type -
telnet smtp.ntlworld.com 25

if you get a connection, you can try typing -
EHLO
QUIT

That will show whether your computer can get through to NTL's smtp server.

Have you tried using Outlook Express or Thunderbird rather than Outlook?

07-08-2007, 13:21	#11
Aragorn Inactive Join Date: Apr 2004 Location: Minas Tirith, Gondor Age: 61 Posts: 3,458	Re: Cannot Send Email! According to this page, error 421 is 'Command not available'! eg Outlook might be trying to use an SMTP feature not on the ntlworld server!! Try pulling up a command prompt ('Start','Run', "cmd") and type - telnet smtp.ntlworld.com 25 if you get a connection, you can try typing - EHLO QUIT That will show whether your computer can get through to NTL's smtp server. Have you tried using Outlook Express or Thunderbird rather than Outlook?