Swoosh.Email.header

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

header(email, name, value)

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Specs

header(t(), String.t(), String.t()) :: t()

Adds a new header in the email.

The name and value must be specified as strings.

Examples

iex> new() |> header("X-Magic-Number", "7")
%Swoosh.Email{assigns: %{}, attachments: [], bcc: [], cc: [], from: nil,
 headers: %{"X-Magic-Number" => "7"}, html_body: nil, private: %{},
 provider_options: %{}, reply_to: nil, subject: "", text_body: nil, to: []}