double spacing in signatures replying to iphone messages

I had posted a Double Spacing complaint about the signatures. I have fixed the signature by using NotePad and getting it like I want it, and then cut and pasting it to signature in eM Client. That does seem to work fine.

BUT…

When I respond to an email from iPhone everything is double spaced including the signature. I spend a lot more time fixing these responses and would like to not have to do that. My response tying is fine, but the signature and spaces between the reply and the message are double and very large. It would be nice to be able to not have a double spacing problem. I assume this is a linux to windows problem.