olemus
tagastustele reageerimine meili- ja meililistisüsteemis
= response to mail bounce

ülevaateid
https://wordtothewise.com/2016/06/bounce-handling-is-hard/
https://www.linkedin.com/pulse/bounce-email-handling-best-practices-julia-gulevich
https://postmarkapp.com/guides/transactional-email-bounce-handling-best-practices