We are having issues routing mails to a few internet domains. 99.5% of our mail is routed correctly to the internet. The remaining 0.5% appear to have the following issue:
Routing mail to an internet address that is hosted or 3rd party routed fails. For example, assume you send an email to myfriend@somedomain.com. Per the MX record for somedomain.com, the address is xxx.SomeoneElse.com. So my assumption is mail is forwarded by the registrar to a mail server on somedomain.com or stored by a hosting company on its own mail servers. Our Domino server will constantly poll xxx.SomeoneElse.com to attempt to send the email. Eventually, it gives up and we receive delivery failure reports. However, if I jump to my Hotmail.com account, the mail is delivered successfully and almost instantaneously. I had one of the intended recipients mail me something and the email was routed correctly to my inbox, so the problem is only outbound. According to the IT person that performed this test, they are not currently blocking any IPs nor is their spam filter routing the mail to a junk folder. The mail never leaves our server (it remains in Mail.box).
We ran some TelNet tests and here is what we determined: The connection is dropped/refused when tel netting from within our corporate network. However, tel netting from an open, un-associated DSL line allows us to connect (HELO). We’re pretty sure the receiving SMTP server is refusing our connection but we don’t know why.
Any ideas?
thnx,