I have exchange 2013, we migrated from exchange 2003 by import/export (messup). We have been running for about a year. Now I get complaints of exchange sending read receipts to old emails. I have checked one of the mailboxes, It's getting it from "microsoft outlook" (MicrosoftExchange158e71ec99ae9866bbc36ab6ce58802e@domain.local). I have checked this user had "Ask me before sending a response" or "Never Send a response", however this server keeps on sending them out on old emails on a nightly basis. This includes internal as well as external email addresses. People keep on complaining that they get sooo many every night.
Environment: windows server 2012 with exchange 2013. NOT virtual.