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The homepage has a feature comparison with Sendgrid. Sendgrid doesn't have email receiving, inboxes, attachment parsing.

Yes it does. As far as I recall, all major email providers handle inbound email. Sendgrid, Postmark, Mailgun, SparkPost, AWS SES.

(I don’t think this compromises the value of AgentMail, just clarifying what is supported elsewhere.)

Yes, some providers support receiving via webhooks (or some other notification), but lack the inbox infrastructure that Gmail and AgentMail offer.