Postmark seems to have very good diagnostics. They seem to have quite fine grained control over bounce lists too, which Sendgrid is shockingly bad at. I haven’t

Postmark seems to have very good diagnostics. They seem to have quite fine grained control over bounce lists too, which Sendgrid is shockingly bad at. I haven’t evaluated Mailgun in detail. Interested to know what factors led you to switch?