Hello,
Our environment is currently going through a company acquisition. We are currently migrating Exchange users from the other company's server into our domain. As a precaution, we disabled Outlook's Auto-Complete feature to avoid NDRs. I believe this to be related to a mismatched legacyExchangeDN attribute.
My question is... when an external address e-mails one of these recently migrated mailboxes, do those messages use the above-mentioned attribute for delivery? Ultimately, I would like to avoid external businesses from receiving NDRs due to these migrations.
Thanks for any info received.