We have in our O365 environment some functional mailboxes where a primary address is set to ex.
The alias is being set to :
Whenever a mail is sent in O365 to the alias, the to header is kept intact ( to: firstname.lastname@example.org )
When that mail is retrieved via poP3 / 995 : it seems the to field is change to the primary address : email@example.com
Has anyone seen this behaviour?