Frequency of Mail Check?

Hi did you find a solution for this? – I too need to set the frequency to circa 5 mins.

Thanks

If the question still is relevant…

Open /plugins/post-by-email/class-post-by-email.php
search for:
wp_schedule_event( current_time( 'timestamp', 1 ) + HOUR_IN_SECONDS, 'hourly', 'post-by-email-wp-mail.php' );
replace HOUR_IN_SECONDS with MINUTE_IN_SECONDS. If you do this it will reduce the time to 1min.
If you want 5 Minutes or more between every check you could solve it with this code:
wp_schedule_event( current_time( 'timestamp', 1 ) + (5 * MINUTE_IN_SECONDS), 'hourly', 'post-by-email-wp-mail.php' );