adjust from email

app/models/user.rb

@@ -49,6 +49,9 @@ class User < ApplicationRecord
 
   EMAIL_REGEXP = /[^@;,<>\s]+@[^@;,<>\s]+/
 
+  FULL_EMAIL_REGEXP =
+    /\A[a-z0-9][\.']?(?:(?:[a-z0-9_-]+[\.\+'])*[a-z0-9_-]+)*@(?:[a-z0-9]+[\.-])*[a-z0-9]+\.[a-z]{2,}\z/i
+
   has_one_attached :signature
   has_one_attached :initials