Does mac mail prefer msg or eml

According to Apple's documentation, macOS Mail (formerly known as Mail.app) can handle both MSG and EML file formats.

However, if you're looking for the default format used by macOS Mail, it's EML. Here's why:

1. EML is the default format: When you compose an email in macOS Mail, the email is saved as an EML file in the .eml format. This is because EML is a widely supported format that can be easily read and written by most email clients.
2. MSG support is limited: While macOS Mail can import and export MSG files, it's not as robust as its EML support. MSG files are specific to Microsoft Outlook and are not as widely supported as EML files. If you try to import a MSG file into macOS Mail, it may not preserve all the formatting and attachments.

That being said, if you need to work with MSG files, you can still use macOS Mail to import and export them. Just keep in mind that the formatting and attachments might not be preserved perfectly.

In summary, while macOS Mail can handle both MSG and EML file formats, it's EML that's the default format used by the app. If you need to work with MSG files, you can still use macOS Mail, but be aware of the potential limitations.