Can't send more than one message at a time via SSL/TSL on our Forum Software

Question asked by ActorMike - 10/31/2023 at 2:18 PM

Unanswered

We moved servers, and now when we send our weekly newsletter to 12,000+ people it only sends one at a time via SMTP. On the other server it would send big batches, but I do not recall the number. The forum software support insists this is related to the mail server somehow. I think I did a ticket about this years ago, but the ticketing system has purged all the old tickets.

Does anyone know what is throttling the SMTP messages?

UPDATE: It appears when emails are send on the website forums via SSL/TLS they are sent one at a time. If switched to non-SSL/TLS transport they go in batches of 91.

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Ron Raley Replied

10/31/2023 at 4:42 PM

Check domain options for "outgoing messages per hour"

Same thing for user "outgoing messages per hour"

Also check Server Admin > Settings > General > Delivery Delay in seconds

Also check Server Admin > Settings > Protocols > SMTP In > Max Messages per Session

ActorMike Replied

10/31/2023 at 5:17 PM

Max Messages per Session= 0

Delivery Delay = 3 (can I set this to zero?)

outgoing messages per hour domain 25000

outgoing messages per hour user 25000

Ron Raley Replied

10/31/2023 at 6:26 PM

Delivery Delay, yes sir. Our installation is set to 0.

How about on that same page, Max Local Delivery Threads

Ours is set to 50.

ActorMike Replied

10/31/2023 at 6:50 PM

Ours is also set to 50.

Ron Raley Replied

10/31/2023 at 7:55 PM

Have you dug into SMTP logs? Could be something more apparent in there. Good luck!

ActorMike Replied

11/1/2023 at 5:59 AM

I figured out the issue. If I setup the email transport method to SSL it will only send emails 1 at a time. If I do not use SSL/TSL it will send 91 at a time! Big difference!

Now I am trying to determine what is causing this.

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