RE: Problem with outbound mails

  • From: Olomo Opeyemi <hoppy_lumz@xxxxxxxxx>
  • To: "\[ExchangeList\]" <exchangelist@xxxxxxxxxxxxx>
  • Date: Mon, 1 Jul 2002 10:18:51 -0700 (PDT)


Thanks so much, your tip was really useful. But I
think the problem has to be with the DNS. I have this
following error message in my Event viewer

Event Type:     Warning
Event Source:   MSExchangeTransport
Event Category: Connection Manager 
Event ID:       4000
Date:           7/1/2002
Time:           6:11:25 PM
User:           N/A
Computer:       OOH_LAG1
Message delivery to the remote domain ''
failed for the following reason: Unable to bind to the
destination server in DNS. 
0000: c00402d5 

I really don't know what is wrong with the DNS records
cos I updated them. I can hit on port 25 of Internet
SMTP servers but I can surf the net.

U have any suggestions or tip on this. Cos I'm really
getting fusrated.

--- "Walkowiak, Matt" <Matt.Walkowiak@xxxxxxxxxxxx>
> - Re-Vamped!
> First thing, turn on SMTP logging - Servers -->
> Server name -->
> Protocols --> SMTP --> right-click on Default
> SMTP... and enable
> logging, and turn everything on.
> Then, pick your favorite SMTP server out on the
> Internet and try and
> "hit" it on port 25.
> telnet 25
> you should get a 220 response.
> If you don't, make sure you can surf the internet.
> If you get a 220 response, then you need to make
> sure the domain name
> you are sending from exists in an A record.  If the
> SMTP logs above, you
> might see error messages saying "domain does not
> exist"  What some SMTP
> servers out there do is bounce your request to send
> back at you, to make
> sure you are really a mail server.  If they can't
> see you, they reject
> you.
> This kinda thing happened to me.  (forgive my poor
> composition skills if
> this makes no sense :)
> In the setup of a mail server (Imail, not exchange)
> it asks you what the
> FQDN of the mail server should be.  I entered
>  I never
> did have an A record for - I didn't
> think I would need
> it.  What I did do was have the MX record for
> point to
> - basically the FQDN of my router.
>  SO...  when I
> would try and send a message, my mail server would
> connect to the
> receiving SMTP server fine, then do an HELO from
>  The
> receiving SMTP server at some point tries to talk
> back to
> to make sure it is actually a mail
> server, but it looks
> for an MX record of, not just
> - getting
> nothing back, it believes that my server is bogus
> and sends my packets
> to the bit-bucket.
> In other words, I'd look hard at DNS and where
> everything is pointing
> to.
> Also look at those log files.
> Matt Walkowiak
> -----Original Message-----
> From: Olomo Opeyemi [mailto:hoppy_lumz@xxxxxxxxx] 
> Sent: Monday, July 01, 2002 2:19 AM
> To: [ExchangeList]
> Subject: [exchangelist] Problem with outbound mails
> - Re-Vamped!
> I have a problem with my exchange server. It all
> started when my ISP changed my IP address and I had
> to
> reconfigure my DNS records and my router
> configuration
> to accomodate the chane. Initially my exchange was
> working fine but all of a sudden all remote mails
> started bouncing back. We can only send and receive
> mails locally. We cannot send remote mails but we
> can
> receive them.
> I've checked System administrator to see if there is
> any peculiarities but there seems to be none. 
> Pls help.
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