I'm adding a company wide email signature in the Office 365 Admin area under Rules - Mailflow > Apply Disclaimers. I am then using their tags such as %%FirstName%% and %%LastName%% to insert the users details into the signature.
Is it possible to conditionally show HTML depending on whether a tag has a value? E.g. I want to show a pipe character (|) if the %%MobileNumber%% tag has a value. How do I check if that tag has a value?