Last post Sep 14, 2008 05:59 AM by xpost
Sep 11, 2008 07:15 PM|xpost|LINK
I am currently running a consolidated V 3.5 architecture
I am having trouble sending mail to certain domains.
MS SMTP Diag tool gives the below error
Connecting to the server failed. Error : 10060
Failed to submit mail to mail.domainname.com
Most mail flows through OK, but there are certain domains that will just not accept mail from my server.
HMC V 3.5 Cannot relay mails to certain domains
Sep 12, 2008 08:47 AM|Russell Tomkins|LINK
Do you have an example of the SMTP protocol logs when sending to one of the servers responsible for these domains? Can you establish a socket to TCP/25 from your sending SMTP bridgehead to the server specified in the error message?
Sep 12, 2008 09:52 AM|DmitriG|LINK
1. Check MX record for "mail.domainname.com"
2. Use telnet to simulate SMTP session between your front-end server and MX in mail.domainname.com
Sep 12, 2008 10:27 AM|PowerK6|LINK
Does your server have a PTR record? some servers may do reverse dns resolving.
Of course, simulate a SMTP session is helpful.
Sep 13, 2008 02:15 PM|xpost|LINK
Thanks for the reply, I got PTR, SMTP diag test gives error 10060. I also try configure a new smtp connector to relay only for a particular domain, also ends in failure. No issues with DNS.
Thanks & Regards
Sep 13, 2008 06:17 PM|xpost|LINK
Thanks for the reply! could you please explain me how to establish a socket to TCP/25?
Sep 13, 2008 09:38 PM|Russell Tomkins|LINK
Simply do the following.
Open a command promt and run "telnet mail.domain.com 25" replacing mail.domain.com with the MX for the domain in question. You should get a black screen with a SMTP banner, if not their can be a couple of possibilities.
PTR records the others are referring to, are the corresponding DNS records for the IP address of your sending server. Many Anti-Spam implementations will block your server from sending to them if your PTR is not configured, or not correct. You can test if
your PTR record is registered by doing a "nslookup 127.0.0.1" replacing 127.0.0.1 with the public IP that your sending server uses. If it is working correctly, you will get a response that matches the name configured in your SMTP connector.
If not, this may be causing your issue. You should be able to determine if this is your issue by looking in your SMTP protocol logs.
Sep 13, 2008 11:09 PM|PowerK6|LINK
How to Use Telnet to Test SMTP Communication
XFOR: Telnet to Port 25 to Test SMTP Communication
two articles for your ref.
Sep 14, 2008 05:59 AM|xpost|LINK
Thanks Again!! When i try to establish a connection using telent i got the error message "could not open connection to the host on port 25: connection Failed"
Well i have another Exchange 2003 server for my inhouse, i also try to use this server as a relay server (using as smarthosts)in HMC but it gives NDR "You dont have permission to send this email". could you help me to setup exchange 2003 to act as a smarthost,
also would like to know how to investigate furhter the issue. Thanks in advance!!