Postkmarkapp (postmarkapp.com) is also providing such a thing. Just like Mandrill, they don't let you forward it to any inbox; however, I was already using them

Postkmarkapp (postmarkapp.com) is also providing such a thing. Just like Mandrill, they don't let you forward it to any inbox; however, I was already using them to process the e-mails and send a JSON payload to a webhook of mine, so it solves my problem apparently. I just hope their uptime is decent.