Email attachments are files sent with messages. Learn common attachment limits, deliverability risks, and how to send attachments safely.
An email attachment is a file included with an email that a recipient can download or view. Attachments can be documents, images, audio, spreadsheets, and more, and they’re typically encoded to travel safely through email systems.
Attachments can affect deliverability and user experience. Large attachments may be blocked by providers or cause the message to exceed size limits. Certain file types can be flagged as risky, especially executable formats, and some corporate gateways may quarantine messages with unexpected attachments.
A safer approach is to share a secure link to the file (for example, from your cloud storage) and keep the email body clear about what the file is and why it’s being shared. Always consider privacy, permissions, and whether the recipient expects the attachment.