26 October 2015

Having gone back and forth with Salesforce Technical Support and experienced first-hand the question of email & attachment sizes, I wanted to provide some clarity on the 5, 10, and 25 MB numbers floating around the help docs.

Inbound Email

Includes on-demand Email-to-Case and Apex email services

  • Approx. 18 MB for all attachments
    • 25 MB for the entire email, including headers and encoding
  • No individual attachment size limit

“Standard” Email-to-Case does not have Salesforce limits since emails remain on the email server

Outbound Email

Includes email templates and Apex Messaging methods

  • 10 MB for all attachments
  • No individual attachment size limit
    • 5 MB when attaching from a Document

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