I understand the smtp issues are my problem. But... Just now I was testing the smtp mailer on the site. I sent a test mail in my smtp test mailer and as I expected it failed. I turned off the smtp, saved and went back and sent a test mail and it was successful.  I went back to the smtp settings and turned it back on sent another test mail and that was successful. Now that my inbox was flooded it seems to be working again

. I have been using the very same email server for over a year with zero problems till a very short time ago. That's why I'm saying that I don't think it's a problem with my smtp server. Plus it stopped working just when the new site was changed over to the main site.