Likely fix
Fix: Email won’t send with attachment
Emails with attachments fail when the file is too large, blocked by security rules, still uploading, stored only in the cloud, or using a file type the mail service refuses.
Quick answer
Remove the attachment, send a simple test email, then use a file-sharing link or compress the file instead of attaching it directly.
Important warning
Many email services block executable files and very large attachments, even if the message text is fine.
Try this
- 1 Remove the attachment and try sending the email without it.
- 2 If the email sends, the attachment is the problem.
- 3 Check the file size.
- 4 Compress the file if possible.
- 5 Use a cloud link instead of attaching the file directly.
- 6 Avoid blocked file types such as executable files.
- 7 Rename files with unusual symbols if upload fails.
- 8 Wait for the attachment to fully upload before clicking Send.
Common causes
Attachment is too large.
Attachment is still uploading.
File type is blocked.
Cloud file is not shared correctly.
Unstable internet connection during upload.
Message exceeds the mail provider's size limit.
What to check next
- Check whether the email sends without the attachment.
- Check the file size.
- Check whether the attachment upload completed.
- Check whether the file type is blocked.
- Check whether a cloud link works better.