And you have to build up the volume gradually. In the industry this is called "warming up IP addresses". See for example https://help.elasticemail.com/en/articl

And you have to build up the volume gradually. In the industry this is called "warming up IP addresses". See for example https://help.elasticemail.com/en/articles/2788598-how-to-warm-up-a-private-ip https://help.elasticemail.com/en/articles/2788598-how-to-war... or https://docs.aws.amazon.com/ses/latest/dg/dedicated-ip-warming.html https://docs.aws.amazon.com/ses/latest/dg/dedicated-ip-warmi...