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Hey SMTP Error Codes and Bounce Messages

HEY is a paid mail service from 37signals. It screens senders per recipient, so there is little a sender can do to influence delivery because each recipient decides which addresses they accept.

Codes on record
1
Responses
1

Postmaster & documentation

550

SMTP 5501 response

Low severityView all
5.1.1Low severity

smtp;550 5.1.1 <[email protected]>: Recipient address rejected: User unknown

A hard failure. The receiving server has refused the message for good and will not accept an unchanged retry without a change on the sending side. See SMTP 550 across every provider

Hey bounce questions

›Why is Hey bouncing my email?

HEY is a paid mail service from 37signals. It screens senders per recipient, so there is little a sender can do to influence delivery because each recipient decides which addresses they accept. Match the exact wording of your bounce to one of the 1 responses on this page to find the specific reason and fix.

›How do I improve deliverability to Hey?

Authenticate with SPF, DKIM and DMARC, keep your sending IP and domain reputation clean, mail only engaged recipients, and honour unsubscribes. Hey also publishes postmaster guidance, linked on this page.

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