Permanent (5xx)
SES: AttachmentRejected (Permanent)
Attachment type not allowed
The receiving server permanently refuses this message because of an attachment's file type.
Common causes
- Attaching an executable or otherwise disallowed file type (e.g. .exe, .bat, sometimes .zip).
What to do
- →Don't attach executable file types in transactional email - link to a hosted download instead.