Knowledgebase

Email Attachment Size Limits (Firstserv Guide)

Firstserv email services support a maximum message size of 50MB.

What Does This Limit Include?

The 50MB limit applies to the entire email, including:

• ✅ The message body
• ✅ All attachments combined

📌 This means the total size of everything in the email cannot exceed 50MB.

Important to Know

While 50MB is the maximum allowed on Firstserv:

• ⚠️ Many email providers and ISPs impose lower limits
• Common limits are around 20–25MB per email

👉 As a result, even if your email sends from Firstserv, it may still be rejected by the recipient’s mail server if it exceeds their limits.

Best Practice for Large Files

Email is not designed for transferring large files. For anything sizeable, we recommend using a file-sharing service instead.

Recommended Alternatives

• ✅ WeTransfer – https://wetransfer.com
• ✅ Dropbox
• ✅ OneDrive
• ✅ Google Drive

Why Use File Sharing Services?

• ✅ Handle large files more reliably
• ✅ Avoid email delivery issues
• ✅ Faster and more secure transfers
• ✅ Provide download links instead of attachments

Summary

• Maximum email size: 50MB (including attachments and message content)
• Many recipients may only accept 20MB or less
• For large files, use dedicated file-sharing services

If you’re unsure why an email was rejected or need help choosing the best way to send large files, the Firstserv support team is always happy to help.