Try telnet to smtp port of mail server that you can not send emails. Probably you will see a blank black screen. Type "ehlo domain.com" on black screen and press enter. Now you should be able to see SMTP banner.
If you try telnet to this mail server on smtp port you will see SMTP banner without typing any other command.
Problem is caused by "TCP autotuning" feature that is not supported by routers. We should disable autotuning feature to solve this problem.
Type the command below in the command prompt and press Enter
netsh interface tcp set global autotuninglevel=disabled
After doing this process restart the email server and try sending email to releated domain.
Thursday, February 5, 2009
Exchange 2007 is working on Windows 2008 server and you can not send emails to some domains...
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