Bamboo.SesAdapter.set_email_tags

You're seeing just the function set_email_tags, go back to Bamboo.SesAdapter module for more information.
Link to this function

set_email_tags(mail, email_tags)

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Set email tags

Example

email_tags = [
  %{
    "Name" => "color",
    "Value" => "red"
  },
  %{
    "Name" => "temp",
    "Value" => "cold"
  }
]
email
|> Bamboo.SesAdapter.set_email_tags(email_tags)