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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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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
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ActorMike Replied
10/31/2023 at 6:50 PM
Ours is also set to 50.
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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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