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Everything works great except I have to click "Resume" for every 140 messages (sending speed 14 emails/second - so it is 10 times that ammount).
Sendy is on dedicated server. Version 188.8.131.52
Sending times out mainly due to server memory exhaustion.
If you setup a cron job for sending (recommended), Sendy can automatically resume sending when sending time out due to any reason so you don't have to babysit sending by clicking 'Resume' when it times out.
Also, as you are on a dedicated server, try increasing your PHP's allocated memory_limit to a larger number.
Hope this helps.