Wow.
Not sure where to start.
I will try to point you in the right direction and you will have to do a lot’s of reading and educate yourself on these topics:
-
List management and scalability, inboxing:
Mautic lands in promotions or spam folders, seems to be impossible to tweak, any idea? - #17 by joeyk -
Sending faster with Mautic and how to
Matching SES send rate -
Read more about how email sending works in Mautic in general
This Is How Email Sending Works In Mautic - YouTube
TLDR:
- don’t send too fast
- your smtp provider might slow down your send
- make sure you have the right infrastructure