After the Xink client have updated email signatures in Outlook for the first time, recipients may not see the image/logo.
Instead image/logo show as Red X in recipient inbox.
First, try and close Outlook and re-open Outlook (no need to reboot PC).
This will enable image/logo to be shown in recipients inbox.
No need to insert image again or make changes to your design.
Still an issue?
Set 'Send Pictures With Document' HKCU registry via GPO: