Error "Email address doesn't exist"

Topic summary

Multiple Shopify merchants are experiencing a persistent issue where transactional and marketing emails fail to send to certain customers, displaying the error “Email address doesn’t exist” despite verified, correct email addresses.

Key Details:

  • Emails that fail include order confirmations and marketing messages
  • The problem persists even after deleting and re-adding the email address to customer profiles
  • Third-party verification tools confirm the email addresses are valid
  • At least one case involves a mac.com email domain

Critical Impact:

  • With New Customer Accounts enabled, affected customers cannot log in, creating a significant access problem
  • Merchants report difficulty reaching Shopify support for assistance

Current Status:

  • Shopify support has acknowledged the issue and claims to be working on it
  • The problem has persisted for at least 2 months without resolution
  • No workaround or fix has been identified yet
Summarized with AI on October 26. AI used: claude-sonnet-4-5-20250929.

Same issue. Support says they are working on it. it’s now 2 months later. this is critical issue because we have switched to New Customer Accounts and this leaves the customer with no way to login.

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