501 Invalid Host Name Error   

Hello,

I'm using Exchange 2000 on a Windows 2000 Adv Srvr box.
When I send an email to a particular external recipient I get an NDR that 
reads:

550 SMTP; 501 INVALID HOST NAME & THEN IT LISTS MY MAILSERVER & DOMAIN NAME.

My domain name is NOT a registered site, just an internal domain name used 
in my LAN.  Is it possible the recipient's mail server is rejecting my 
messages due to this?

Also, when I try to run a Telnet test from inside and outside my PIX, I get 
the "550 Invalid host name world." error.


Thank you.

date: Tue, 14 Mar 2006 12:16:27 -0800   author:   bsbm525

Re: 501 Invalid Host Name Error   

Well, first if you want to send to External SMTP addresses you will need to 
get a registered domain name.  Secondly you will also have to configure your 
PIX for allowing SMTP in/out to your Exchange Server.  Here is link to help 
you get started in hosting your SMTP mail with Exchange Server.

http://www.msexchange.org/tutorials/MF002.html

-- 
John Oliver, Jr
MCSE, MCT, CCNA
Exchange MVP 2006
Microsoft Certified Partner

"bsbm525"  wrote in message 
news:EFCB9530-B084-44DE-A15C-8805FA15C4B7@microsoft.com...
> Hello,
>
> I'm using Exchange 2000 on a Windows 2000 Adv Srvr box.
> When I send an email to a particular external recipient I get an NDR that
> reads:
>
> 550 SMTP; 501 INVALID HOST NAME & THEN IT LISTS MY MAILSERVER & DOMAIN 
> NAME.
>
> My domain name is NOT a registered site, just an internal domain name used
> in my LAN.  Is it possible the recipient's mail server is rejecting my
> messages due to this?
>
> Also, when I try to run a Telnet test from inside and outside my PIX, I 
> get
> the "550 Invalid host name world." error.
>
>
> Thank you.
>

date: Sat, 18 Mar 2006 17:01:12 -0500   author:   John Oliver, Jr. [MVP]