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unable to relay mail

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15 replies

by lheisey

Closed to new repliesThis discussion is closed. It stays readable, but it takes no new replies.

Power failure. Servers down. Bring all servers up. ISA in front of Exchange 5.5 SP4. Mail not being received

"""Message from yahoo.com.
Unable to deliver message to the following address(es).

:
69.7.200.66 does not like recipient.
Remote host said: 550 5.7.1 Unable to relay for
lheisey@microplasticsinc.com (this is me of course)
Giving up on 69.7.200.66.""

So what is up with this? What does it mean? None of the
mail from Friday made it to us. Never backed up on the ISP's server. They said once connection was made here it bounced back to SENDER. Is that theory correct?

15 replies

by joseph moore

I just sent you a test mail, and I want to see if it bounces back and why.
But I was able to connect to your SMTP server successfully, so TCP port 25 is open and the SMTP server is listening. So right now, not sure. The MX records look ok, pointing to mail.microplasticsinc.com with a weight of 10.
Hmmm....

by lheisey

I am asking why the error occurred, whether my ISP's theory is in fact correct. I know all is fine now.

by mark

The key is the IP address. Whois 69.73.200.66? It resolves to 69-7-200-66.cimcoisp.net. Is that a connection to your server or the ISP? That address is what bounced your mail based on the fact that it believed it was not configured to relay mail for your email address. It could have been your email server or your ISP's. Either way it is true that your ISP is not "holding" your mail unless you have a POP account and you are retrieving it from them. In most cases you use SMTP which tries to get to the final destination or bounces back.

by lheisey

69.73.200.66 I have no idea what that IP is Our ISA (firewall) is 69.7.200.66. Cimco is my ISP and we have a T-1 up. When my mail is down Cimco is to collect it on their server until ours is back up. That didn't happen. I still don't understand the problem. HELP

by pierrejamme

When I ask Whois (Karen Kenworthy Utility) for your IP# I get:
No Default Regional Internet Registry found for IP Address.69.7.200.66
Suggestion: Try one of the non-Default Servers.

when I test your domain in: http://www.dnsreport.com/
I get numerous warnings, check it out, you need some fine tuning it looks like.

by lheisey

Domain Name: MICROPLASTICSINC.COM
Registrar: NETWORK SOLUTIONS, INC.
Whois Server: whois.networksolutions.com
Referral URL: http://www.networksolutions.com
Name Server: NS1.CIMCOISP.NET
Name Server: NS2.CIMCOISP.NET
Status: ACTIVE
Updated Date: 03-oct-2003
Creation Date: 16-dec-1997
Expiration Date: 15-dec-2006
Is this not correct? Who should the default regional internet registry be?

by cg it

so far, from your last comment with your WhoIs info, everything looks correct. Possibly what has happened is a spammer might have tried to use your email address for spamming and was blocked during relay. A NDR unable to replay notice would be sent to you as it was your email address. I had this problem and was related to spammers hijacking email address from Community Forum groups. Another possibility is that a spammer was trying to use your Exchange Server for Relay.

by cg it

If a spammer hijacked your email address there that doesn't mean there's something wrong with your Exchange Server other than you might be an open relay. Something to check. I doubt there's anything really wrong with your Exchange Server if it's been running great. One thing I do suggest is blocking viewing your WhoIs information at your domain name registrar. Spammers can just get your domain name info from WhoIs and clone your domain name to spam. This has become a big problem lately with all the spam filters on Mail programs. Spammers get paid by the # of emails sent out and will do just about anything to keep sending mail out so they get paid.

by lheisey

I still am not understanding this at all. Why wasn't my ISP able to collect the mail that didn't make it to me? Maybe yoiu could define "Relay" for me. Would a spammer have hijacked all our addresses here? How do I determine if I am an open relay?

by cg it

you've rejected 4 answers so far. One from Joseph Moore who knows more about Windows based networks than Microsoft does. I think the answer to the question you asked in your comment to my suggestion is self evident.

Maybe someone else attempt an answer.

by lheisey

If I accept it will close the question. I am just trying to get the help I need for a clear understanding. My company lost 24 hours of mail to all 60 mailboxes. They want an answer and I am trying to understand so I can formulate that very answer. Thanks.

by mark

Typo on the IP, sorry. What the message says is that your EMail Server was up and responding but rejected the email based on the user. Perhaps the Server had not finished updating it's user database from the DC in AD? I would agree with the ISP. If your EMail server is responding, he has no control over what it does with the email. His fail safe probably only kicks in when your server does not respond.

by mark

More information about the setup is needed to give you a better answer. Your ISP should be in the best position to give you a clear written explanation. You pay them for service, so ask them for a written explanation and post it here and we can tell you if it is plausable or BS.

by lheisey

Thanks... they said that my server was up and responding and that once contact is made with my server they no longer can collect the mail. They are not sure what happened on my end. I host my server onsite and besides the power outage that occurred everything appeared very functional.

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