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As far as I know, most e-mail products focus only on sending e-mails and not receiving them. Mailgun works both ways.

Sendgrid accepts incoming emails: http://nanceskitchen.com/2010/02/21/accept-incoming-emails-i...

My interpretation is that this provides a mailbox API, to provision and maintain mailboxes on THEIR servers. Doesn't sendgrid just perform a restful post when an email is received rather than store it and all? Almost akin to pop vs imap.

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