Every PHP process can stay for at most the “execution time limit” set on php.ini. From the log I see the time used by newsletter is 299 seconds, 5 minutes. So you cannot do more than that, probably your server cannot send more than 1300 email in 5 minutes.
1300 emails in five minutes are 4 email per second… even is the SMTP server si in the local network, that is not a bad value… you should have better result installing an SMTP in the web server in smarthost mode, so it receive and enqueue the emails and the deliver them to the SMTP server. That can be a more efficient configuration since the local SMTP can be quicker in sending tons of emails.
Bye, Stefano.
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