You can attach files to your message, but it's best to keep the total size of your email under 10 MB, as some email gateways will reject messages larger than that.
Here's how to add an attachment:
- Go to the Messages tab.
- Choose your message
- Choose Message > Edit Attachments from the menu bar.
The Attachments window will give you a list of your message's attachments. Click the "+" button to add a new one.
Why attachments appear to grow in size
When you attach a file to your message, you may notice that the attachment size listed in Direct Mail is roughly 33% larger than the file size listed in Finder. For example, if you attach a 1 MB PDF, Direct Mail may show it as being 1.3 MB in size. The reason for the discrepancy is that files must be encoded in a special way before they can be attached to an email message. This encoding process usually increases the size of the attachment by about 33%. In order to help you gauge the size of your outgoing email, Direct Mail shows you this larger size.
Why some attachments are zipped before sending
There are some kinds of attachments that Direct Mail will automatically compress into a ZIP file before sending. These include folders, bundles, and file packages. Direct Mail does this in order to make sure that all email servers and email clients are able to correctly download and display the attachment (and because Internet email only supports "flat file" attachments).