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A failed attachment is usually about hitting a specific limit, not a general email malfunction.
Size Limits
Most mail servers cap attachment size, commonly around 25MB — check your specific mailbox settings if a large file consistently fails.
Blocked File Types
Certain file extensions (like .exe) are commonly blocked by mail servers as a security measure against malware — renaming or zipping the file sometimes gets it through.
The Recipient's Limits, Not Just Yours
Even if your outgoing limit allows a file, the recipient's inbox might reject it based on their own mail server's limits — worth confirming with them if the issue is one-sided.
The Reliable Alternative
For large files, sharing a download link (via cloud storage) instead of a direct attachment sidesteps size limits entirely.
