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← Microsoft 365 Help
Fix rejected email with a bounce error
Use this Domain Striker checklist to fix rejected email with a bounce error on Microsoft 365. Confirm access and recent changes first, then apply the targeted fix before you rewrite DNS or rebuild the site.
A bounce means the receiving server rejected the message. Use the bounce code to pick a fix.
- Open the bounce notification and note the SMTP code (for example 550, 552, or 554) and rejected address.
- Confirm the recipient address is spelled correctly and still accepts mail.
- In Domain Striker DNS, verify MX and SPF for your sending domain match the Domain Striker Microsoft 365 values.
- Check whether the mailbox is full, disabled, or missing on your plan.
- Send a short test message again. If it still bounces, contact Domain Striker support with the bounce headers.
Need more help? Call Domain Striker support at 402-STRIKER (402-787-4537) or visit help.domainstriker.com.