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We changed upn in on prem directory but that also changing smtp primary address? How it is possible?
Hi, that will happen if you have an email address policy:
Look through that doc and see if you have one set
Do you mean that other domain suffixes are automatically added to the domain that do not have an email address policy? The Exchange2019 documentation also applies to Exchange2016.
Yes .other domain suffix automatically adding .example , when user email is firstname.lastname@example.org and upn is email@example.com then if you change upn to firstname.lastname@example.org ,your primary e-mail change yo email@example.com
You could refer to these links:
This link does not answer my question why upn change in on prem server also changes primary smtp
Are the mailboxes that are changing have this set?
"Automatically update email addresses based on the email address policy applied to this recipient"
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