Ralph Angenendt wrote:
to the amount of the messages per digest.
It cannot be set by "number of mails before a digest is sent out", but only as "size in kB a digest should grow to before it is sent out".
This size is set fairly huge, so it never seems to be reached - 30 MB.
Strewth! The default Postfix mailbox size is 10 Mbytes.
Calculate how long it takes a 30 Mbyte message to go through a modem. Imagine if the poor sod waiting for it is downloading something else at the time.