Quick & Dirty: Convert IMCEAEX strings to X500
I have already described the problem in another article: Users receive an undeliverability report (NDR) when trying to send to mailboxes or distribution lists. The field code in the NDR is "550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found'. Here is an example of such an NDR: The problem occurs, for example, when a distribution list is migrated to a shared mailbox ... Read more
