# Magic Links Tutorial
## With a mix task
You can use `mix ash_authentication.add_strategy magic_link` to install this strategy.
The rest of the guide is in the case that you wish to proceed manually.
## Add the Magic Link Strategy to the User resource
```elixir
# ...
strategies do
# add these lines -->
magic_link do
identity_field :email
registration_enabled? true
sender(Example.Accounts.User.Senders.SendMagicLink)
end
# <-- add these lines
end
# ...
```
### Registration Enabled
When registration is enabled, signing in with magic is a _create_ action that upserts the user by email.
This allows a user who does not exist to request a magic link and sign up with one action.
### Registration Disabled (default)
When registration is disabled, signing in with magic link is a _read_ action.
## Create an email sender and email template
Inside `/lib/example/accounts/user/senders/send_magic_link.ex`
```elixir
defmodule Example.Accounts.User.Senders.SendMagicLink do
@moduledoc """
Sends a magic link
"""
use AshAuthentication.Sender
use ExampleWeb, :verified_routes
@impl AshAuthentication.Sender
def send(user_or_email, token, _) do
# will be a user if the token relates to an existing user
# will be an email if there is no matching user (such as during sign up)
Example.Accounts.Emails.deliver_magic_link(
user_or_email,
url(~p"/auth/user/magic_link/?token=#{token}")
)
end
end
```
Inside `/lib/example/accounts/emails.ex`
```elixir
# ...
def deliver_magic_link(user, url) do
if !url do
raise "Cannot deliver reset instructions without a url"
end
email = case user do
%{email: email} -> email
email -> email
end
deliver(email, "Magic Link", """
Hi #{email},
Click here to login.
""")
end
# ...
```