[MM3-users] unwanted chunked delivery

hello,

we've a mailing-list with currently 81 recipients running with debian-dist mailman3 3.3.3-1.

every post to this list will be chunked into one delivery with 60 recipients and one delivery with 21 recipients.

we've searched a bit and found a config-option "max_recipients" for bulk-transfers, but we haven't set it and (as we understand the explaination for this option) then there should be no limit in one transfer to the MTA.

nevertheless, we've tried to set it to a high value, but even this doesn't change anything in behaviour.

any search for '60' within mailman3 gives no relevant results.

could someone tell us, where the limit of 60 comes from and how we could change it to unlimited?

thanks.

omf