Unable to send emails to some domains

October 14, 2010 at 02:57:55
Specs: server 2003
we are facing a problem with sending mails to some domains, the mail server is working fine we can send and recive emails for aproximetly all domains but some we are facing problems with, and some we face delays in delivering the mails, so it will take about 2 or 3 hours to be sent or to be delivered to us from certain domains.
these errors some times are sent back to us:
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<xxxxl.xxxx.dom #5.5.0 smtp;550 #5.7.1 Your access to submit messages to this e-mail system has been rejected.>


well can aynone please help in this issue???


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#1
October 14, 2010 at 11:34:10
Seems, that these mail servers use spam filter and blocks your email-domain or ip address. I assume, you're using a static public ip address for your mail server.
Otherwise, on using a dynamic ip address, you will get much more e-mail-rejections.

I would suggest to contact one of those recipients and ask about such problem.
The IT-Service should be able to track down, why your e-mails gets rejected on their mail server.

The original poster should always write the last response !!!
Let us know, if the problem is solved !!!


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#2
October 14, 2010 at 14:18:46
The problem is with the remote host. They are either using some form of Block List/Grey list/Black List that has your IP address on it. There is also the possibility that your mail server doesn't have the correct records in DNS assuming the remote host is doing reverse lookups. In which case your mail server would need to have a matching MX and PTR record. How are you sending email? Via DNS or Smarthost?

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#3
October 15, 2010 at 03:14:11
Dear Paul,
you are right i am using a static public IP. is their any way to over come this issue from my side since i need to fix this problem ASAP and as you know going to the other recipients may take lot of time?
Dear Scurla,
wish i get your name correctly ;)
well yes i am using my a DNS, can we do any changes to add those recepients on it, or any thing else???

thanks in advance for your responce.


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Related Solutions

#4
October 15, 2010 at 07:09:32
Because you are sending email via DNS check with your ISP that you have a PTR record in public DNS that matches your MX record with your name registrar. In other words if your MX record = mail.com > 1.1.1.1 then the PTR record 1.1.1.1> mail.com. This must be done with your ISP because they own the subnet and not with your domain registrar.
Failing that create a smarthost add the relavent address spaces and route the mail via the smarthost (usually the clients ISP) as they will have a properly configured mail relay/server.

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#5
October 15, 2010 at 09:39:22
To check, whether your e-mail-servers IP address is blacklisted, or the MX record is set correctly, check this website:
http://www.mxtoolbox.com

The original poster should always write the last response !!!
Let us know, if the problem is solved !!!


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#6
October 15, 2010 at 10:50:27
well i did this test and appears that my server that is the dns also is not black listed even after typing its public IP also the same result, some mails are going through now but taking long time i can see them in the server qeue, well if their is any other idea i will be glad to here in the mean time i will try to get a DNS from my ISP to see if i will over come this problem.

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