Have a situation where we are receiving email (could be anywhere from 500k - 1mln daily) and need to forward them to a third party parsing service. We would be forwarding these emails only to a single third party email address. We're currently using O365 and they only allow 10k outgoing messages per account per day. We would be setting up a subdomain specifically for this.

Does anyone have any experience with a similar situation? Any advice on a solution would be greatly appreciated. Asked about SES because the link below appears to be my use case but I'm not familiar with AWS services so including.

https://aws.amazon.com/blogs/messaging-and-targeting/forward-incoming-email-to-an-external-destination/