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I’m sad

Can't submit reply to post and PM.

I can't post a reply to posts or PM. When I submit the reply the following words appear.

Mail Error!
SMTP protocol failure!
Host: localhost
Return Code:
Return Msg:
Invision Power Board Error: Could not open a socket to the SMTP server
Check your SMTP settings from the admin control panel.

Please help me how to solve this.
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