afaik mailchannels does not have a free offering for inbound mail
afaik mailchannels does not have a free offering for inbound mail
https://jeff.invalid/sg/random_string_here). (I'd also stick a random query parameter in there as an extra measure, as your random string POST endpoint will be visible in your CF dashboard, and it also helps if you ever screw up with basic auth implementation.)
abuse, postmaster, and unsubscribe as usernames, which could be a dealbreaker. https://docs.sendgrid.com/for-developers/parsing-email/setting-up-the-inbound-parse-webhook#testingpostmaster@jeff.example for signing up for things like https://senders.yahooinc.com/complaint-feedback-loop/. abuse, postmaster, and unsubscribe . (We've tested all three on our main root domain.)

dig sendgrid.ai.moda MX returns mx.sendgrid.net.3600 seconds set and I have yet to see anyone who sends me stuff more often than 24 hours lol. (But we don't send out a ton of email yet.)
message.setReject() responds on the SMTP side? Does it return some kind of 5xx to the client or does it 2xx accept the message and silently drop it?

https://jeff.invalid/sg/random_string_hereabuseabusepostmasterpostmasterunsubscribeunsubscribepostmaster@jeff.exampledig sendgrid.ai.moda MXmx.sendgrid.net.3600message.setReject()