when I post a new topic, it shows:
SMTP connection could not be established

after attempting to resend couples of time, still show:
SMTP connection could not be established.....Then
I find my 4 posts in the forum

Tried to send message to admin and DBmob, I did it before.
I want to delete my old post, never get an answer.

Now I want to delete my extra 3 posts I put today.  Could anyone just tell me how?

And what this "SMTP connection could not be established" shown on screen but the post still successfully been put on the forum?