The envelope in the envelope....necessary?

[gm51]

I've sent a letter, but I didn't include the envelope with my address in....this my reduce the possibility of a reply?
I've included the IRC!!

Thanks for yuor help!

[barmy_army008]

It might reduce your chances a bit, but not too much. After all, you've included a way to pay for postage which will cost a lot more than an envelope.