Every app I build ends up needing to send email, signups, password resets, receipts. Sending it is the easy part. Keeping it out of the spam folder is the part that always bit me.

Here's how it usually goes wrong: a few bad addresses bounce, someone marks an email as spam, and slowly your whole domain's reputation drops. Then even your good emails start landing in spam — and you find out days later from an annoyed user.

I started using Sendhiiv because it handles this part for you:

• Drop-in setup, point your app's existing SMTP at it, no rewrite needed.
• Full API access, connect your app and send emails automatically (welcome mails, receipts, resets) straight from your code.
• It pauses itself, if too many emails bounce or get marked as spam, the send stops automatically, before your domain takes the hit.
• Bounces and unsubscribes are handled for you, no scripts to maintain.
• Real inboxes, every address can actually receive replies, instead of being a dead "no-reply" address.

That's it. Sending email is easy. Sending it well is the hard part, and that's the bit worth not doing by hand.

(Full disclosure: I work on Sendhiiv. Happy to answer questions in the comments.)