If sending tokens for a large survey, you might run into problems with your provider, because sending several mails at the same time might qualify you as a spammer. The default batch size for the emails sent from LimeSurvey is 50. It is possible to reduce this number, but in older versions this is not so easy.
In LimeSurvey versions <= 1.86 there is no user interface to change the value for advanced features of the general settings. The only possibility to change such settings is looking them up in config-defaults.php and then manually adding them to config.php.
For the mail batch size the following line has to be added:
$maxemails = 25;
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