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Cant send mail to one domain

otyew
otyew asked
on
Medium Priority
2,673 Views
Last Modified: 2012-05-07
dear all,

I'm having this problem when i'm trying to send an email to this domain and the NDR reply that I get is:

Your message did not reach some or all of the intended recipients. May I know the cause of this error?


      Subject:      TEST
      Sent:      01/07/2009 11:39 AM

The following recipient(s) could not be reached:

      yyy@tungshin.com.my on 01/07/2009 11:25 AM
            The e-mail system was unable to deliver the message, but did not report a specific reason.  Check the address and try again.  If it still fails, contact your system administrator.
            < mail.xxx.com.my #5.0.0 smtp; 550-Callback setup failed while verifying <xxx@xxx.com.my>    550-(result of an earlier callout reused). 550-The initial connection, or a HELO or MAIL FROM:<>    command was 550-rejected. Refusing MAIL FROM:<> does not help fight spam, disregards 550-RFC    requirements, and stops you from receiving standard bounce 550-messages. This host does not    accept mail from domains whose servers 550-refuse bounces. 550 Sender verify failed>
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Author

Commented:
the problem is that after emails are out of exchange, it will pass through mailsweeper before it is being sent. so i am not sure if this is applicable to exchange or not. btw is this our issues or the other parties issue?
well I suppose it could be deemed your problem since you may not have the correct PTR records in DNS.
Does your mail server have a corresponding DNS entry they can lookup?
http://blogs.technet.com/industry_insiders/pages/sender-verify-failed-with-incorrect-reverse-dns-record.aspx
Top Expert 2009
Commented:
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Author

Commented:
tested it before and why only this url is having problems but not others as well? we are dealing with a lot of external users from normal home users till corporate clients but only this are having problems.
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Author

Commented:
also this happens last week and when i run a check on our mailserver ip, it was in blacklist. it was fine after it was removed but now, it doesnt seems to be the problem.
Top Expert 2009

Commented:
hmmm not really sure, perhaps that particular smtp server is doing extra smtp verification as i can see "command is rejected"
what i'll do is to forward or relay emails for that particular domain to isp smtp server
if you are using exchange, just create a smtp connector for that particular domain
Top Expert 2009

Commented:
in other words, all problematic smtp domain to be forwarded to isp smtp server for relaying
IT Infrastructure Architect
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Commented:
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Author

Commented:
this is on a fixed ip btw, what should we do about this? so this means that the other side is doing a reverse dns checking and since we do not have it, it rejects our mail?
you got it in one..
Subash SundharanIT Infrastructure Architect
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Commented:
Yes...To resolve this you need to establish a reverse DNS record for your outbound IP address or contact the remote email admin to check the alternative (white listing or pass through IP)

Author

Commented:
i guess i can send it now. it is because of the blacklist.....but i think the reverse dns plays a part of it. the i am not sure why it get blacklisted daily. hope to get some comment before i close this? btw, it was CBL who blacklisted us, only this one.

ps-it is hard to give u guys the points everyone will get some. i will raise my points and then will choose the best answers.  thanks guys
Subash SundharanIT Infrastructure Architect
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Commented:

Author

Commented:
ok, the problem is this. before the mail goes out, it will be passing though a spam filter (mimesweeper). is the configuration should be done through exchange or this spam filters?
Subash SundharanIT Infrastructure Architect
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Commented:
You need to check all your exchange servers and make sure that it is not open relay. Also run ExBPA to verify the configurations.

Is mimesweeper scanning your outgoing emails?

Author

Commented:
yes, mailsweeper is scanning. since exchange mail will go through the mailsweeper, i guess it is the mailsweeper that needs to be configured.
Subash SundharanIT Infrastructure Architect
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Commented:
Yes you can fine tune the mail sweeper to block the outgoing/incoming SPAM but it is also important that your exchange servers should not be open relay because if your exchange is an open relay any Trojan/Virus or anyone could Send Spam Through your server which may cause trouble for you as no SAPM filtering system is capable of blocking 100% SPAM, Always prevention is better than cure.
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