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I've noticed the PHP email users function sends in batches while the SMTP blasts them all out quickly. Is there a way you can throttle the sending of messages on SMTP like the PHP mail current does?
We don't do any throttling when handing messages to PHP. It immediately calls your MTA. If there's some sort of batching or throttling, that would be happening within the MTA itself (and it's likely more appropriate for the server actually sending the mail to be doing that).