Outook 2019 attachment after migrated Exchange from on-premises to Online

New Contributor

Hi all.

i am migrating my company exchange server from on-premises to exchange on line.

Actually we have a server with ADConnect  and we use the exchange we have as hybrid.

All works but i have a problem with some attachment in the emails.


We receive the email but the attachment (for example .pdf) cannot be opened.

I have found a workaround that is to ADD the sender to a list of SAFE SENDER.

The attachment is then seen in the message and can be saved.

As you can imagine we cannot add each time one-by-one a sender to have its attachment opened and then saved.

Any help ?


Thanks to all




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