signup: don't send welcome emails to invalid addresses.

Fix attempting to send welcome emails when user didn't provide a valid
email address.

app/controllers/password_resets_controller.rb

@@ -4,7 +4,7 @@ class PasswordResetsController < ApplicationController
   def create
     @user = User.find_by_name(params.dig(:user, :name))
 
-    if @user.can_receive_email?
+    if @user.can_receive_email?(require_verification: false)
       UserMailer.password_reset(@user).deliver_later
       flash[:notice] = "Password reset email sent. Check your email"
       respond_with(@user, location: new_session_path)

app/controllers/users_controller.rb

@@ -79,7 +79,7 @@ class UsersController < ApplicationController
       flash[:notice] = "Sign up failed: #{@user.errors.full_messages.join("; ")}"
     else
       session[:user_id] = @user.id
-      UserMailer.welcome_user(@user).deliver_later
+      UserMailer.welcome_user(@user).deliver_later if @user.can_receive_email?(require_verification: false)
       set_current_user
     end