IIS and SMTP - #5.7.1 smtp;550 5.7.1 Unable to deliver to <user@domain.com>>

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Author #5.7.1 smtp;550 5.7.1 Unable to deliver to <user@domain.com>>
Glen

2007-08-07, 7:17 pm

Hi,
The CEO at my firm is unable to email a friend at an external email domain.
I have tried without any luck as well. On the bounceback email it states:

You do not have permission to send to this recipient. For assistance,
contact your system administrator.
<mail.ourdomain.com #5.7.1 smtp;550 5.7.1 Unable to deliver to
<user@domain.com>

I have read countless MS KB articles for the last few days and nothing seems
to work. We sit behind a cisco PIX 515E firewall and one of the articles
stated that the fixup protocol SMTP 25 command line should be disabled. I
tried disabling it, reloaded the firewall and no luck. I am convinced that
our email domain is not blacklisted on the recipient's mail server. Any
suggestions would be greatly appreciated.

Thanks!


--
Glen
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