message: refactor restricting default value
diff: @@ -22,5 +22,5 @@ export default {
  pass: process.env.MAILPASS || ''
  },
  mailSender: process.env.MAILSENDER || 'no-reply@geli.edu',
  - teacherMailRegex: process.env.TEACHER_MAIL_REGEX || '@h-da.de$',
  + teacherMailRegex: process.env.TEACHER_MAIL_REGEX || '$',
  };
  