With Bounce Management enabled, when I send an email to a lead from a Salesforce org, the sender's smtp.mailfrom
property appears as follows.
martyc=example.com__11isvlfxp7f8lvm9.y6yenshnuv0yenlp@kbkhv95j1kx61wqh.9sw88.6a-2gprrua4.na50.bnc.salesforce.com
Can anyone explain to me or help me understand how the kbkhv95j1kx61wqh.9sw88.6a-2gprrua4.na50.bnc.salesforce.com domain was generated by Salesforce?