====== Step by Step: (CSV) ======
  * Create a New Message ("File -> New -> Message")
  * Add the Variable(s) to To, e.g.: {{Email}} or {{FirstName}} {{LastName}} <{{Email}}>
  * Add other Recipients to Cc (optional) (variables are supported)
  * Add other Recipients to Bcc (optional) (variables are supported)
  * Add the Subject (variables are supported)
  * Add the Body (variables are supported)Kedves {{name}}!
bla bla {{param}}
neduddki
  * Add the Attachments (optional)
  * Click "File -> Mail Merge"
  * Select "CSV" and check "Deliver Mode"
  * Add (individual) Attachments (optional) (variables are supported)
  * Select "Filename" and check "Character Set", "Field Delimiter" and "Text Delimiter"
  * Check "Start", "Stop" and "Pause" (optional)
  * Click "OK"
Ha magyar a win, akkor nem UTF8, hanem win1252!!!!!!!!!!!!!!!!!!
Windows 1252
https://addons.thunderbird.net/hu/thunderbird/addon/mail-merge/