8o8o wrote, "How large of an attachment can actually be sent via email? 1MB? 10MB? Or even 100MB? While the size of email boxes has increased to the GB level, the size of attachments remains at a relatively low level. This may be because email clients (such as Thunderbird and Outlook) are not specialized download software, and downloading large emails often leads to disconnections.If you don't mind English too much, you can try out the service from yousendit. All it takes is simple registration, and you can send attachments up to 100MB through their website.After becoming a registered user: log in to the site, fill in the recipient's address, additional information, upload the file, and send it. It’s all that simple. You needn’t worry about a 100MB attachment overwhelming some smaller email accounts (like company email). Yousendit simply sends a downloadable link to the recipient. The recipient can use specialized download software to open this link, which increases download speed and avoids connection drops.As a free user, uploaded files are retained for only 7 working days (i.e., the validity period of the download link), and can be downloaded up to 100 times.To send even larger files, you can upgrade to a paid user, allowing you to send files up to 2GB in size. Below is the pricing and service comparison:"