libkf5mime-dev 18.04.3-0ubuntu1 (arm64 binary) in ubuntu cosmic

 This library provides an API for handling MIME data. MIME (Multipurpose
 Internet Mail Extensions) is an Internet Standard that extends the format
 of e-mail to support text in character sets other than US-ASCII, non-text
 attachments, multi-part message bodies, and header information in non-ASCII
 character sets.
 .
 This package contains the development files.