| .eml file | mailto: | Mapi | Outlook (COM) | Outlook (cmd line) | UWP (Share menu) | AppKit | Thunderbird (cmd line) | Gmail (browser) | Outlook live (browser) | |
|---|---|---|---|---|---|---|---|---|---|---|
| To | Yes | Yes? | Yes | Yes | Yes | No | Yes | Yes | Yes? | Yes? |
| CC | Yes | Yes? | Yes | Yes | Yes | No | No | Yes | Yes? | Yes? |
| BCC | Yes | Yes? | Yes | Yes | Yes | No | No | Yes | Yes? | Yes? |
| Subject | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Text body | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Html body | Yes | No | No | Yes | No | Yes | Yes | Yes? | No | No |
| Images in body | Yes | No | No | Yes | No | No (for now) | No? | No? | No | No |
| Attachments | Yes | No | Yes | Yes | 1 max | 1 max (for now) | Yes | Yes | No | No |
| Open as draft | ? | Yes | Yes? | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Windows | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes |
| MacOS | Yes | Yes | No | No | No? | No | Yes | Yes? | Yes | Yes |
| Linux | Yes | Yes | No | No | No | No | No | Yes? | Yes | Yes |