IIS and SMTP - 550-ADMIN BLOCK

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Author 550-ADMIN BLOCK
Bill Whipple

2004-01-24, 2:05 am

Received the following from a user this morning:
Sent email and received -

<ex2k01.ads.mediserve.com #5.5.0 smtp;550-ADMIN BLOCK:
This Host does not accept connection without a valid
Reverse>

Message quit at that point. ???
Jenny Frye [MSFT]

2004-01-24, 2:05 am

Hello Bill,

This sounds like the remote host is doing a reverse DNS lookup for your host
and is not finding PTR records configured for it. You'll need to add a PTR
record to your DNS records in order to send to this host (or any other that
perform reverse DNS lookup.)

--
Jenny Frye
Microsoft PSS

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