Recommended maximum email size

Introduction

Sending emails with attachments that are too large can cause rejections, errors, or messages that never reach the recipient. Even if your account allows the sending, the receiving provider may enforce its own limits.

This guide explains the recommended maximum size for an email and what to do if you need to share larger files.

Recommended size

No specific miHosting.com size limit is stated here for the total email size, but many external providers apply restrictions when they receive mail.

As a general recommendation, avoid sending emails larger than 25 MB, including attachments.

Why a large email may fail

A large message may be rejected because:

• the recipient server does not accept large attachments
• the recipient mailbox is full
• the external provider has a lower limit
• the sending takes too long or times out
• a filter treats the attachment as suspicious

Also, the real email size is usually bigger than the file itself because attachments must be encoded for transport.

What to do if you need to send large files

If the file is over 25 MB, it is better not to attach it directly. Instead:

1. Upload the file to your hosting by using File Manager or FTP.
2. Copy the direct URL of the file.
3. Put that link in the email.
4. Explain briefly what the recipient will find there.
5. Test the link before sending the message.

Example:

You can download the file from this link:
https://yourdomain.com/downloads/video.mp4

Useful tips

• compress documents into .zip when it makes sense
• avoid attaching executable or suspicious files
• use clear file names
• make sure the link does not return a 404 error
• remove temporary files from hosting when they are no longer needed

Common problems

The email is rejected

The recipient server may not accept a message of that size. Reduce the attachment or use a download link.

The recipient cannot open the file

Check that the upload completed correctly and that the link is public or accessible for that person.

The email takes too long to send

Large attachments consume more time and bandwidth. Compress the file or share it through a link instead.

Conclusion

To avoid rejections, try to keep emails below 25 MB whenever possible. If you need to share larger files, upload them to your hosting and send a download link instead. It is usually more reliable and much easier for the recipient.