The maximum file attachment size allowed with Tresseo’s email or webmail service is 50MB. This limit helps keep email servers running smoothly and prevents delivery problems. Understanding this restriction helps you manage your email communication better and find smart solutions when you need to share larger files with clients or team members.
Google (Gmail) has a maximum file attachment size of 25MB, and Outlook (Outlook.com and Microsoft 365) has a maximum file attachment size of 20MB (though some accounts may support up to 34MB).
Keep in mind that your recipient’s email service also has limits. Tresseo allows you to send attachments up to 50MB, but your recipient may not be able to receive them. Gmail blocks attachments larger than 25MB, and Outlook blocks anything over 20MB.
Understanding Email Attachment Limits
Why Email Has Size Restrictions
Email servers work like postal delivery trucks. Each truck has a weight limit. If packages are too heavy, the truck cannot move efficiently. Similarly, email servers set attachment limits to process messages quickly and reliably.
The 50MB limit protects both sender and receiver. When you attach files that are too large, several problems can occur. Your message might bounce back. It could get stuck in the sending queue. The recipient’s inbox might reject it entirely.
Think of email like a highway. Smaller vehicles move faster. Large trucks slow down traffic. Email attachments work the same way. Smaller files travel quickly through servers. Larger files take more time and resources.
What Happens When You Exceed the Limit
When your attachment exceeds 50MB, you will likely receive an error message. The email system will not send your message. You might see notifications like “attachment too large” or “message size exceeded.”
Your email client will usually warn you before sending. Pay attention to these warnings. They save you time and prevent frustration.
Working Within the 50MB Limit
Tips for Managing Large Attachments
You can compress files before sending them. Compression tools reduce file sizes significantly. ZIP files are common and easy to create. Most operating systems include built-in compression features.
Images often take up considerable space. Resize photos before attaching them. You rarely need full-resolution images for email. Medium-quality images look great and use less space.
At Tresseo, we recommend reviewing your attachments before clicking send. Check file sizes in your email draft. Remove unnecessary attachments. Send only what recipients truly need.
Alternative Solutions for Large Files
Cloud storage services offer better options for large files. Services like Google Drive, Dropbox, or NextCloud work perfectly. Upload your file to cloud storage. Share a download link through email instead.
This method has several advantages. Your email stays small and sends quickly. Recipients download files at their convenience. You can share files larger than 50MB easily.
File transfer services provide another solution. WeTransfer and similar platforms specialize in large file sharing. They let you send files up to several gigabytes. Most offer free versions for basic needs.
Best Practices for Email Attachments
Always describe your attachments in the email body. Tell recipients what files you included and why. This practice helps them understand the purpose before downloading.
Consider splitting large projects into multiple emails. Send files in batches if necessary. Number them clearly: Part 1 of 3, Part 2 of 3, and so on.
Scan attachments for viruses before sending. This protects both you and your recipients. Most email providers scan automatically, but extra caution never hurts.
Name your files clearly and professionally. Use descriptive names like “Project_Report_January_2026.pdf” instead of “Document1.pdf.” Good naming helps recipients organize their downloads.
Remember that the maximum file attachment size allowed with email serves an important purpose. It maintains system performance and reliability. Work with this limit rather than against it. Your email communication will be more efficient and professional.
