Binary package “libmailtransport4” in ubuntu bionic

mail transport service library

 Mailtransport is a library that provides the following functionality:
 .
  * Shared mail transport settings.
  * GUI elements to configure mail transport settings.
  * Job classes for mail sending.
 .
 This package also contains a KDE control module which can be embedded
 into your application to provide mail transport configuration.
 .
 This package is part of the KDE Development Platform PIM libraries module.