Using Classic Outlook on Windows for personal email, calendar, and contact management
Hi Michael,
Greetings.
Thank you for raising your concern in this community.
The shared mailbox works with the use of permissions. So as long as you have the required permisions you should be able to send emails to the shared mailbox.
Could please confirm if it is affecting one gmail sender or all gmail sender?
Do the sender get a Non Delivery Report after sending the emails?
I will be waiting for your feedback.
Regards,
Mac