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What is the maximum file size an email attachment can be?

The file size limit for email attachments on the service is 25MB.

The main reason for this file size limit is security. Without these limits it would be possible for malicious users to bombard email servers with huge email attachments and ultimately crash the servers. Even if we were to increase the file size limit on our end, there is no way of ensuring that a recipient's server would accept a file of that size.

If the file attachment size is too big, and rejected by the recipient's server, you will usually be notified with what is known as a bounce message. These exist primarily to inform users that their email has not been received, and provides a brief reason why.

Should you wish to send a file to a recipient that is over 25MB in size (or has otherwise been rejected by their mail server) there are two alternatives available that would allow you to work around these limits:

- Using a cloud storage or FTP link (a solution such as Dropbox, Google Drive, etc.) can provide users with a link to download the file, this can then be inserted into an email.

- Using file compression software (such as Winzip, or the native functionality built into most operating systems) to make the file smaller for the purposes of attachment.

Service News

Updated 230 days ago

Server Maintenance 18th June 07:00 BST

12:11 on 12th Jun

We have been informed by our data centre that they will be preforming some power tests on the 18th June 07:00 BST for approximately four hours. During this time there is a risk of our service going down on all platforms. We are currently taking measures to for this scenario.

Server Maintenance - Wed March 13 to Fri March 22

10:25 on 12th Mar

Dear members,

We will be performing maintenance on the servers between Wednesday March 13th and Friday March 22.

Services should remain available during this time, however, there may be a few moments of disruption as servers are taken offline and services fail over.