552 5.3.4: message too big
The message is larger than the receiving server allows.
Permanent failure (hard bounce)
What 552 5.3.4 means
Your email, including attachments (which grow about a third when encoded), exceeds the recipient server's size limit. Limits are commonly 10 to 25 MB.
Common causes
- Large attachments
- Images embedded at full size
- A very long thread quoted in the reply
How to fix it
- Shrink or compress attachments
- Share large files as a download link instead
- Keep marketing emails well under 100 KB of HTML
What to do with the address
This is about your message, not the address. The address is fine.
Check an address now with the free email checker, or look at a domain's mail setup with the email domain checker, MX lookup and SPF checker.
Related error codes
Frequently asked questions
- What does 552 5.3.4 mean?
- The message is larger than the receiving server allows. Your email, including attachments (which grow about a third when encoded), exceeds the recipient server's size limit. Limits are commonly 10 to 25 MB.
- Is 552 5.3.4 a hard bounce or a soft bounce?
- Permanent failure (hard bounce). The address will keep failing, so remove it.
- What should I do with the address after 552 5.3.4?
- This is about your message, not the address. The address is fine.