sylpheed-plugins 3.7.0-8ubuntu4 (arm64 binary) in ubuntu lunar

 This package comprises all loadable plugins which are included
 with Sylpheed sources. Plugins extend Sylpheed by providing new
 features and/or capabilities not present in core application.
 .
 Currently only the unique existing plugin is included:
  Attachment Tool: a plugin for dealing with attachments in messages.