You have the possibility to set up signature delegations.
Delegation makes it possible to display the signature of a user other than the one who is logged in. It also makes it possible to access the signatures of your shared mailboxes.
Access the Users menu
To activate the delegation of a user, go to the user record of the person whose signature you wish to share.
Example:
The shared mailbox support@exemple.com is used by Geoffrey, Julie and Gabrielle.
We will therefore go to the user record of the support account to perform the operation.
Add the delegation
From the user record, click on the Settings tab, then go to the last setting, which allows you to add the users who wish to use this signature. Add the users using their email address.
Save and you are all set!
Windows users:
On the Add-in side, thanks to delegation, the correct signature will display directly when you are writing from the shared mailbox, in addition to having the new signature available to you when opening the Add-in.
Example:
From the user record of the account support@exemple.com. You can click on "Add a delegation". You can add the addresses of Geoffrey, Julie and Gabrielle to this list.
They will now be able to access the support signature, but also apply their own signature to the support email if desired.