This plugin allows displaying sender profile images of the FOSS libravatar service or any compatible implementation. It also makes use of configurable disk caching to minimize network requests. Supports all relevant missing profile modes of the service, which provide alternate avatars (either dynamically generated or predefined) for addresses which don't have a libravatar (nor gravatar) profile.

Here are a few screenshots illustrating the features:

• The plugin in action showing author's badly centred selfie. This comes from gravatar server, through libravatar service.
  
   
   
• A missing profile, using an empty custom URL icon mode, which returns the libravatar logo.
  
   
   
• A missing profile, using a custom URL icon mode, the icon comes from Wikipedia's Smiley.
  
   
   
• A missing profile, using predefined “Mystery man” missing icon mode.
  
   
   
• A missing profile, using Identicon missing icon mode.
  
   
   
• A missing profile, using MonsterID missing icon mode.
  
   
   
• A missing profile, using Retro missing icon mode.
  
   
   
• A missing profile, using Wavatar missing icon mode.
  
   
   
• A missing profile, in “None” missing icon mode, showing the Face header contained in the message