signup alert email
+*from
+*to
+*cc
+*bcc
+*subject
User signed up for John Abbe's Decko
+*html message
User has signed up on John Abbe's Decko.
-- the machines running John Abbe's Decko
+*text message
User has signed up on John Abbe's Decko.
See User's card: https://johnabbe.decko.org/User
-- the machines running John Abbe's Decko