Can you please bring option of how many messages is processed per connection in Bulk Main option to workaround this type of issues?

What is the exact limit the mail provider is setting there?

There is already this setting with 500 as default.

\define( 'BULK_MAILS_PER_CYCLE', 100 );

That might help. But it can restart multiple times and cause a limit per time (instead of limit per connection) issue.

For bulk mail per time, feel free to add to my earlier request: https://invisioncommunity.com/forums/topic/476938-feature-request-better-control-of-bulk-mails-per-time/

Edited March 21Mar 21 by opentype