Fix the 550 email blocked error

Definitions

The 550 email blocked error means that your email was rejected by your recipient’s email service, usually because it didn’t meet certain sending requirements.

The 550 email blocked error can appear in various forms, some common variations include:

• SMTP Error 550
• SMTP Error 5.5.0
• 550 Invalid recipient
• 550 User account is unavailable
• 550 Address rejected
• 550 No such user here
• 550 Not our Customer
• 550 Account not available
• 550 Sender verify failed
• 550 Verification failed for [email protected]
• 550 Mailbox Does Not Exist

Before you start

✅ Regardless of the reason, you can fix the 550 email blocked error quickly.

ℹ️ Follow each step by step fix below in order, moving to the next only if the previous one doesn’t work.

Step by step

The 550 email blocked error may be due to different reasons, and below are the best and quickest fixes to resolve the problem and send your email to your recipient.

1. Check your recipient’s email address: Make sure you typed your recipient’s email address correctly.

2. Make sure you have the right email: Make sure you are sending to the correct email address and that your recipient’s email address exists and is operational.

3. Check your email address: Make sure your email address is correctly setup in your email app on your device. It should have the correct IMAP and SMTP settings.

4. Switch SMTP ports: Some internet service providers block certain SMTP ports. Try using a different port for outgoing mail on your email app. If you’re using port 587, switch to 465 – or vice versa.

5. Update your email app: Make sure you are using the latest version of your email app on your device. You can also opt to send your email via webmail.

6. Review your email content: Avoid using phrases or content that might look like spam or trigger spam filters. Keep your language professional and clear. Follow best practices to avoid ending up in spam.

7. Review email authentication settings: Make sure your email domain is properly set up with SPF, DKIM, and DMARC records.

8. Ask your recipient to ‘whitelist’ you: Contact your recipient through another method and ask them to add your email address to their ‘always allow’ or ‘whitelist’.

9. Reduce your send rate: If you’re sending a large volume of emails, try reducing the rate at which you send as some email services have rate limits, and may rate limit you at higher volumes.

10. Use a different email account: If possible, try sending the email from a different email account to see if the block is email service or device-specific.