Relevant Products: Signature Manager Outlook Edition
You are using Exclaimer Signature Manager Outlook Edition and you want to treat internal and external email messages differently when applying signatures.
For example, you want to apply a signature with a sales image and full contact details for external recipients, but no image and only brief details for recipients within your organization.
It is not possible to configure these products to apply signatures based on whether email messages are internal or external.
This is because the signature is automatically added as soon as the user chooses to create a new email message, or to reply/forward an existing email message. At this point, the email message has not been sent or categorized by Microsoft Exchange as being internal or external.
The only way you can implement this functionality is by using one of Exclaimer's server-side solution (Signature Manager Exchange Edition for Microsoft Exchange server).
Otherwise, the sender will have to manually define whether they want to keep, do not want to keep or delete the signature applied to each email they send.
Remember that you can create multiple policies with different signatures and allow users to choose between them when composing an email message in Outlook. So, you can define separate policies for internal and external emails, new emails and replies, and so on.