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* Total file size limit: Email providers have a limit on the total size of attachments in a single email. This limit is typically around 20-25 MB. Some providers might allow slightly larger files, but it's generally best to stay within this range to ensure deliverability.
* Individual file size: Even if you're below the overall limit, very large individual scan files might cause problems.
* File format: Some file formats (like highly compressed PDFs) are more efficient than others (like large image files).
* Recipient's email provider: While less common, the recipient's email provider might have stricter limits than your own.
Practical Considerations:
* Small Scans: If your scans are small (e.g., a few hundred KB each), you could potentially attach many files before hitting the size limit. You might attach 10-20 small scans.
* Large Scans: If each scan is several MB (e.g., high-resolution images or multi-page documents), you'll be able to attach far fewer, perhaps only 2-5, before exceeding the limit.
Best Practices:
1. Check the total file size: Before sending, make sure the total size of all attachments is below 20-25 MB.
2. Compress files: If possible, compress the scans into a ZIP file. This can reduce the overall file size.
3. Use PDF format: Scanning to PDF is usually a good option, as PDFs are often more compact than image formats.
4. Reduce resolution: If the scans are for viewing on a screen and not for printing, reduce the resolution to a lower DPI (dots per inch).
5. Consider cloud storage: If you have a large number of scans or individual files that are too large, consider uploading them to a cloud storage service (e.g., Google Drive, Dropbox, OneDrive) and sharing a link in the email. This is often the most reliable way to share large files.
6. Multiple emails: If you cannot reduce the size of the files and cannot use cloud storage, send the files in multiple emails, each containing a subset of the scans and staying within the size limits.
In summary: There's no exact number, as it depends on file sizes. Focus on keeping the total attachment size under 20-25 MB, and consider alternative methods like cloud storage for large files.