net-mail/
altermime

alterMIME is a small program which is used to alter your mime-encoded mailpacks

https://pldaniels.com/altermime/

There are no pull requests

You think something is missing here?
Start with filling a new pull requests.

If you also like to help the Gentoo project, you can consider sending a Pull Request via GitHub.
Before doing so, you might want to take a look at the wiki page.