Error during sending:the opreation was canceled

End of Services: RWS will no longer provide any services related to the installation or updating of TBM.
Existing Installations: TBM will remain functional where already installed, but the RWS support team will not offer assistance in troubleshooting issues, addressing reported problems, or providing further development for TBM.
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Question

i keep getting this error message . my attachment is not large and i used external and internal attachment all same error.

Eugene Kuchynski · Answer

Hello again, Saleem, 
 I was working on your issue and got some results. When I use port 25, I get same error message. Tried to use telnet to connect to my smtp server with port 25, but failed. I'm fully sure that it worked few months ago. Then I switched to SSL connection and port 587, and everything worked well - message was successfully sent. So, recommend you to try the same.

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Error during sending:the opreation was canceled