Attachments when sent in mass emails are stored on the server, with a 30-day link to the attachment embedded in its place. Take a look at the Help window for details on email attachments, but basically any email whose attachments are over 3 MB, or are mass emails, will follow this behavior.
Attachments when sent in mass emails are stored on the server, with a 30-day link to the attachment embedded in its place. Take a look at the Help window for details on email attachments, but basically any email whose attachments are over 3 MB, or are mass emails, will follow this behavior.