Here is an example of using sub-signatures:
Random Advertisements
Using @Formula it is possible to create a set of advertisements that will be appended depending on the time when the email is sent.
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The following formulas are added to three separate sub-signatures. Only one of the formula will evaluate to @True.
@if(@Second(@Created) >= 0 & @Second(@Created) <20 ;@true;@false)
@if(@Second(@Created) >= 20 & @Second(@Created) <40 ;@true;@false)
@if(@Second(@Created) >= 40 & @Second(@Created) <60 ;@true;@false)