Optionalfrom_The name to show as the sender of notification emails.
OptionallocaleThe language and dialect to send the email in
OptionalmemoText to add to email notification bodies
Optionalrelation_The subscriber's relation to the shipping of the package
Optionalreply_The email address to show as the sender of notification emails.
This may require special DNS settings to prevent the emails being marked as spoofed.
Only set this field if you know what you are doing.
OptionalsubjectThe subject line to use on the notification emails
Additional options that may be ignored depending on which carrier the request is sent to.