I bet the post office won't even notice. Some replies take a while--I just had one come back that I waited just over a year for. My record is 3 years!

I would wait a full year before re-sending to them.

Bossc

Well it depends on who you sent to and how long it takes for them to reply.

So I sent some letters at the end of last year (Sep/Oct/Nov) and I'm pretty sure the stamps weren't forever stamps... they were the normal 44 cent ones. And now the price went up a penny. Should I just give up on getting those back? Or try sending again? It's only a penny, I'd like to think they wouldn't mind paying that much to send it back... but it's been almost a year, more than one person, and I haven't gotten any back. Thoughts?