This happened to me with Twilio/Sendgrid. I used their email service on all my projects, never a spammer, only transactional. In fact I used it so little that I

This happened to me with Twilio/Sendgrid. I used their email service on all my projects, never a spammer, only transactional. In fact I used it so little that I think they decided I was not worth it. So someday they closed my account. No email, I just noticed I could not login. Contact support and they ask me to provide a bunch of kyc info, it was a very annoying email thread, but basically all my email integrations were broken for no stated reason. My account had 100% reputation, no billing issues and nothing in my account details was unverifiable. Then the support rep told me that the account was closed by the system, maybe by mistake, but there was no way to reopen an account so I’d have to signup again and then open a support ticket for that account (I think it was to migrate data, no longer remember). Annoyed, I try to signup again, open a ticket and the response was: > We have reviewed your account and have determined that Twilio's services cannot support your account at this time due to one or more of the following: > 1. Violations of Acceptable Use Policy 2. Violations of Twilio SendGrid Email Policy 3. Accounts with unresolved billing issues 4. Inability to verify provided information > Thank you for your interest in Twilio SendGrid, best of luck with your future endeavors. This was from an account with 100% reputation. What I think happened is they were purging low spending accounts. So yes, a company can definitely stop liking you. Gladly I was able to move very quickly to SES.