Thanks Steve and Mark!  Which file has the VERP_DELIVERY_INTERVAL setting?  I 
did not see it in mm_cfg or the .py files in the MTA directory.

We had a pronounced spike again in the /mqueue dir earlier this morning --it 
went up to more than 1200 messages and then 30 minutes later it was back down 
to 110.

Thanks again,

John

-----Original Message-----
From: Stephen J. Turnbull <stephenjturnb...@gmail.com> 
Sent: Monday, November 1, 2021 12:03 AM
To: Mark Sapiro <m...@msapiro.net>
Cc: mailman-users@python.org
Subject: [Mailman-Users] Re: Expected mailq behavior/maintenance commands

Mark Sapiro writes:

 > On the other hand, if VERP_DELIVERY_INTERVAL is set to 0, Mailman will  > 
 > deliver messages to Sendmail in chunks with multiple recipients per  > 
 > message.

Note that personalization also affects this.  For example, if the footer 
contains the subscriber's subscription page URL, the message has to be 
submitted separately for each subscriber.

I think those two settings are everything that affects the ability of the MTA 
to send to multiple recipients in one SMTP transaction.  Mark?

Steve

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