[FIX] Adapt the code and specify the sender, may be removed in a previous commit
[FIX] Remove stupid character in the source code,
[IMP] Add a new template for a new email to destination of the speakers.
[FIX} Define new default parameters for the config for the UnitTests
[FIX] Define the default sender for the Mails
[WIP] Don't forget to fix the templates for a lot of emails
[FIX] Fix the template 'send_thanks.txt' and use the right fields in the template. To avoid the missing fields