What is an attachment?
An attachment is a file sent along with an email message. Email messages can carry multiple attachments. Attachments allow emails to be used as a simple yet efficient file sharing mechanism.
- Archives (e.g., zip) containing multiple files
How do attachments work?
Files included as attachments are encoded using the MIME standard.
What are the limitations of attachments?
In theory, there is no limit to the number or size of attachments sent along with an email message. However, all email providers restrict the size of attachments. Those artificial limits are imposed differently by senders and receivers. For example, while it is possible to send attachments up to 25M over Google's Gmail, many servers on the receiving side will reject messages with attachments that exceed 10M.
Attachments are also subject to security and firewalls rules that often severely limit the use of emails as a file-sharing mechanism. Because viruses, malware, and trojan snippets are usually transmitted via email attachments, many email service providers restrict the type and content of the attachment that they deliver.
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