Signitic's Source connectors only import the primary emails from your directory.
If you want to import email aliases into your Signitic account to assign them a signature template, here's the process to follow.
❶Go to your settings

To enable aliases from Microsoft 365 or Google Workspace, go to Settings and then Connectors. Finally, select Google Workspace or Microsoft 365.
❷Enable/Disable

Select the Filters option to reveal the Email Alias option.
Please note: This option is only available for Microsoft 365 and Google Workspace Source connectors.
Warning: Each imported alias will be considered as a user in Signitic and can have its own data and template and will therefore also consume a license.