What happens when customers don't get your app's emails?

Before we moved to Postmark we were pretty much stabbing in the dark. We hadn’t done all the tedious work that comes with maximizing e-mail delivery rates.

— Tobias Mollstam, Minecraft

Originally we had been receiving reports from some of our users that they weren’t receiving their emails and we discovered that some ISPs and email providers (like Hotmail) were just straight up blocking all emails from us.

— Zack Gilbert, BillQ

Postmarkapp saved us when we switched our production server to Amazon EC2 and later found that our outgoing emails, including order receipts and licenses were blocked by many ISPs. We were in a pure panic mode at the time.

— Roustem Karimov, 1Password

Our users rely on our invitation system, but supporting the related email delivery with confidence would be distracting for us.

— Zach Melamed, Launchrock

…the time not spent dealing with email problems is worth the price of Postmark many times over.

— Chris Dary, Readability