Bamboo.SesAdapter.set_from_arn

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

set_from_arn(mail, from_arn)

View Source

Set the SES FromEmailAddressIdentityArn.

Example

email
|> Bamboo.SesAdapter.set_from_arn("SOME ARN")