Message size limits
There is no limit on the size of the e-mails that you send or receive other than the maximum space for the account. It depends on how much space is available in the receiving mailbox, in order for the recipient to be able to get the mail message.
Please note that the HTTP protocol itself (which is used for attachment uploads in the Webmail) is not too suitable for big file transfers, and timeouts may occur.
If you wish to send large attachments, you better use a standalone mail application, such as Outlook or Thunderbird - please check the online tutorials for configuring the most popular mail clients. There is no maximum size limit for sending messages via our SMTP servers, as long as there is no such limitation applied by the Internet Service Provider through which the messages are sent.