You will need to send a PUT request to /u/{{username}}.json
email_always:true
mailing_list_mode:false
mailing_list_mode_frequency:1
email_digests:true
email_direct:true
email_in_reply_to:true
email_private_messages:true
email_previous_replies:2
digest_after_minutes:10080
include_tl0_in_digests:false