What are the rules during serving with respect to the Doubles Long Service Line?
Can I serve beyond that in a Doubles match?
In a Singles match?
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In a Doubles match you must serve between the Short Service Line and the Doubles Long Service Line, and in a Singles match, you must serve between the Short Service Line and the Singles Long Service Line, also known as the Back Boundary Line.
There is an exception however, for Para-badminton wheelchair Classes singles, the Doubles Long Service Line is used, with the Doubles Sideline and only half the court.
This information is from BWF Section 1 - Laws of Badminton.