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I've updated from 1.7 to Version 2.0.7 , now test mails are not sending, and campaigns says it's sending but nothing happens.
i am using mandril and mailgun smtp. was using the same in the past, in the same server.
I can only suspect that files wasn't fully uploaded. Try re-uploading Sendy:
Download the full build of Sendy from http://sendy.co/get-updated (use the form right at the top to download the full build of Sendy).
Then re-upload all of Sendy's files to your server (except /includes/config.php and /uploads/ folder) replacing the old ones.
Make sure all necessary files are uploaded.
that was it, it's fully working