Mailjet is a French company with a lot of compliance parlance in their website. They are now under the same company as Mailgun (Pathwire) and there are some weird mentions of Mailgun in the Mailjet docs, so I don't know where they're heading.

I was considering using Mailjet, but from the docs it looks like the inbound processing is not as sophisticated as Mailgun: we can't set inbound routes dynamically according to the destination email address.