[gregjor]

AWS has quotas and limits too, just different than Google's and Microsoft's.

https://docs.aws.amazon.com/ses/latest/dg/quotas.html

As usual with AWS, trying to translate their quotas into a dollar amount you will spend takes some work. AWS also throttles API requests, like Google and Microsoft.

I have pushed my customers to SendGrid when they need bulk outgoing email capabilities, and a reasonably easy way to manage bounces and unsubscribes. Twilio owns SendGrid. Their main competitor, MailChimp, got bought by Intuit a while back.

I don't know the details but one customer hosting on GCP uses SendGrid and told me they got better pricing because of the Google partnership. I don't know how that works exactly, just that Google mentions it. GCP doesn't allow bulk emailing from their cloud infrastructure but does allow you to use GMail, or of course through SendGrid.

Most of my customers use a CRM -- Hubspot, Salesforce, etc. -- to manage the whole customer relationship process, which includes inbound and outbound email. You can plug those into SendGrid or Mailchimp if those give you a better set of features or price.