Swoosh.Email.reply_to

You're seeing just the function reply_to, go back to Swoosh.Email module for more information.
Link to this function

reply_to(email, reply_to)

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Specs

reply_to(t(), Swoosh.Email.Recipient.t()) :: t()

Sets a recipient in the reply_to field.

Examples

iex> new() |> reply_to({"Steve Rogers", "steve.rogers@example.com"})
%Swoosh.Email{assigns: %{}, attachments: [], bcc: [], cc: [], from: nil,
 headers: %{}, html_body: nil, private: %{}, provider_options: %{},
 reply_to: {"Steve Rogers", "steve.rogers@example.com"}, subject: "", text_body: nil, to: []}

iex> new() |> reply_to("steve.rogers@example.com")
%Swoosh.Email{assigns: %{}, attachments: [], bcc: [], cc: [], from: nil,
 headers: %{}, html_body: nil, private: %{}, provider_options: %{},
 reply_to: {"", "steve.rogers@example.com"}, subject: "", text_body: nil, to: []}