Send & Receive Issues

How to Fix Sweatcoin Voucher Email Delivery Failed with NDR 550 4.4.7

Olivia Miller Oct 1, 2026 868 views

Question details

The user is unable to send or receive a Sweatcoin reward voucher via email due to a delivery failure returning an NDR (Non-Delivery Report) with error code 550 4.4.7.

How to Fix Sweatcoin Voucher Email Delivery Failed with NDR 550 4.4.7

Product: Email Service / Microsoft Exchange
Device & OS: not provided
Scenario: Attempting to receive or send a Sweatcoin reward voucher email, but the message bounces back.
Observed behavior: The email fails to deliver, and the mail server generates a non-delivery report containing the error code 550 4.4.7.

Before you start

Ensure you have the exact email address of the recipient or sender handy, and verify that your own email account is actively connected to the internet and able to send messages to other addresses.

Solution 1Recommended

Verify the Recipient Email Address and Domain

Error 550 4.4.7 typically indicates that the recipient's domain does not exist or is unavailable. Checking for typos is the most common fix.

A Non-Delivery Report (NDR) with this specific error code usually means the mail server couldn't locate the domain associated with the email address. This happens frequently due to simple typos or expired domain registrations.

Check for typos in the email address

Carefully review the recipient's email address in the 'To' field for any spelling mistakes, missing letters, or incorrect domain extensions (e.g., typing '.con' instead of '.com').

Verify the domain's existence

Open a web browser and try navigating to the website associated with the email domain (the part after the '@' symbol). If the website does not load, the domain may be inactive or unregistered.

Request an alternative email address

If you are the sender, contact the recipient through another method (such as social media or a different email platform) to confirm their active email address.

Verify the Recipient Email Address and Domain

Sweatcoin Support: If you are the recipient trying to get a Sweatcoin voucher, check your Sweatcoin app settings to ensure your registered email address is correct and up to date.

Solution 2

Check DNS and Mail Server Settings

If you are the administrator of the domain receiving the error, you must ensure your MX (Mail Exchanger) records are properly configured.

Solution 3

Contact Microsoft Support or Your Email Administrator

If the email address is 100% correct and the domain is active, the issue might stem from backend server configuration or blacklisting.

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Frequently Asked Questions

What does error code 550 4.4.7 mean in an email bounce back?

Error 550 4.4.7 indicates a routing issue where the sender's mail server could not find or connect to the recipient's domain. It usually happens if the recipient's domain is invalid, expired, or experiencing DNS misconfigurations.

Can I recover my Sweatcoin voucher if the delivery failed?

Yes. If your voucher email bounced, you should contact Sweatcoin's customer support directly through their mobile app. Provide them with your account details and request that the voucher be resent to a verified, alternative email address.

Why did my email bounce back immediately after sending?

Immediate bounce-backs often occur when there is a typo in the email address you entered, meaning the mail server instantly recognizes that the destination does not exist and rejects the message.

Do I need to change my email password to fix a 550 4.4.7 error?

No. Error 550 4.4.7 is a domain and routing issue, not an authentication or security issue. Changing your password will not resolve problems with an unreachable recipient domain.

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