While mailing transcripts to universities, is it necessary to put a?
Only if you want the transcripts to get there. Ask yourself, who has any real interest in this - you, or the universities? If it really matters to them, then possibly theyll be willing to pay the postage. But if the only person to whom it really matters is you, then I suggest you pay. Because otherwise, they may never get there - and whom will that inconvenience??