How to Send Large Email Attachments with QQ Mail, 163 Mail & Chinese Email Services

You need to email a large file — a project archive, a batch of high-resolution photos, a signed contract scan — but your QQ Mail or 163 Mail account won't let you attach it. The file is over 25MB. Your email provider offers to upload it to a "file transfer station" or convert it into a cloud link. The recipient has to click a link that expires in days, or worse, they can't open it because they don't have the right account.

This is a daily frustration for hundreds of millions of Chinese email users. Whether you're using QQ Mail (QQ邮箱), 163 Mail (网易邮箱), Foxmail, 139 Mail, or Alibaba Mail (阿里邮箱), you're hitting the same wall: attachment size limits that haven't kept up with the files people actually need to send.

SendSplit bypasses these limits. It lets you send files up to 200MB as real email attachments — not cloud links, not file transfer stations — through any Chinese or international email service.

Attachment Size Limits on Chinese Email Services

Each major Chinese email provider sets its own cap:

  • QQ Mail (QQ邮箱): 25MB for regular attachments. Larger files are forced into the "file transfer station" (文件中转站), which creates temporary download links that expire in 30 days.
  • 163 Mail (网易邮箱): 25MB regular attachment limit. Large files go to the "cloud attachment" (云附件) system with expiring links.
  • Foxmail: Uses the same backend as QQ Mail — same 25MB limit applies.
  • 139 Mail (中国移动邮箱): 20MB attachment limit. Larger files are converted to cloud links.
  • Alibaba Enterprise Mail (阿里企业邮箱): 25–50MB depending on plan tier. Cloud attachments for anything larger.

The "file transfer station" and "cloud attachment" features sound convenient, but they come with real drawbacks:

  • Links expire — typically within 7 to 30 days, depending on the provider
  • Recipients need the same service — or they must navigate unfamiliar download pages
  • Corporate firewalls block cloud links — many companies restrict access to external file-sharing URLs
  • No offline access — once the link expires or goes down, the file is gone
  • Cross-border issues — recipients outside China may experience slow speeds or blocked access to Chinese cloud services

How SendSplit Works with Chinese Email Services

SendSplit works with any email service — QQ Mail, 163 Mail, Gmail, Outlook, or any other provider. Here's how:

  1. Open sendsplit.com/upload-to-send in any browser
  2. Upload your file (up to 200MB) — documents, photos, videos, archives, or any file type
  3. Choose a split size: 10MB, 20MB, or 25MB (choose 20MB or lower for Chinese email services to stay safely under limits)
  4. Enter the recipient's email address (any provider — QQ, 163, Gmail, Yahoo, corporate email, etc.)
  5. Click send

SendSplit compresses and splits your file into multiple smaller parts, then sends each part as a real email attachment directly to the recipient's inbox. No cloud links. No temporary download pages. No expiration dates.

The recipient downloads the attachments, extracts them, and gets the original file — it's that simple.

Sending a large file with SendSplit

Why Real Attachments Matter for Chinese Users

Chinese email users face unique challenges that make real attachments especially valuable:

  • Cross-border communication — If you're sending files to international partners, they may not be able to access QQ Mail or 163 Mail cloud links due to regional restrictions or slow cross-border speeds. Real attachments arrive directly in their inbox regardless of location.
  • WeChat file limits — Many Chinese users resort to WeChat for file sharing, but WeChat has a 200MB limit and files expire after a few days. Email attachments are permanent.
  • Enterprise compliance — Many Chinese companies block external cloud links for security. Real attachments pass through email security systems and remain in the corporate mail system.
  • Recipient convenience — Not everyone knows how to use a cloud file download page. Real attachments just work — click, download, done.

What Files Can You Send?

SendSplit works with any file type:

  • Documents — PDF contracts, Word files, Excel spreadsheets, PowerPoint presentations
  • Photos — High-resolution images from cameras or design tools (JPEG, PNG, RAW, PSD)
  • Videos — Promotional videos, training recordings, event footage (MP4, MOV, AVI)
  • Archives — ZIP or RAR packages with multiple files inside
  • Design files — CAD drawings, architectural plans, 3D models
  • Audio — Podcast episodes, music files, voice recordings

Tips for Chinese Email Users

  • Choose 20MB split size — Most Chinese email providers cap at 25MB. Using 20MB splits gives you a safety margin to avoid any attachment being rejected.
  • Use SendSplit for cross-border emails — When sending to international recipients, avoid Chinese cloud link services that may be inaccessible outside China.
  • Password protect sensitive files — SendSplit offers optional encryption, ideal for contracts, financial documents, or personal files.
  • Bookmark the upload page — Save sendsplit.com/upload-to-send for quick access. It works from any device — desktop, phone, or tablet.

Who Benefits from This?

  • Foreign trade professionals sending product catalogs, sample photos, and contracts to overseas clients
  • Freelancers and designers delivering large project files to clients who use different email providers
  • Accountants and legal professionals sharing financial reports and legal documents securely
  • Students and researchers submitting theses, datasets, or project materials via email
  • Anyone sending files larger than 25MB through QQ Mail, 163 Mail, or any Chinese email service

Stop fighting attachment limits. Try SendSplit — send files up to 200MB as real email attachments through any email service, including QQ Mail, 163 Mail, and all major Chinese providers.