gmime

MIME mail utilities library and tools for email message handling

brewmacoslinux
Try with needOr install directly
Source

About

MIME mail utilities

Commands

gmime-catgmime-examples

Examples

Display MIME message structure and headers$ gmime-cat message.eml
Extract and process email message parts programmatically$ gmime-cat --headers message.eml | head -20
Verify MIME message integrity and content$ gmime-cat --verbose message.eml