You guys may know about this but its new to me. It always annoyed me that my iPhone email sig had to be different from my Mac email sig as iOS doesn't allow you to utilize colors in your sig, just bold, underline, italic. I like to use some subtle colors in my work email signature. Well I stumbled upon a cool work around. I sent an email from my Mac and then went and viewed that sent email on my iPhone (I use imap email so it syncs). I then highlighted and copied the Mac version of my sig and went into my iPhone email settings and pasted it in the sig area. Now, when I've done this before it automatically removes the color and formatting, which it did this time as well. But this time I shook my iPhone after pasting it and the undo function popped up saying "undo change attributes", I clicked that and voila, it reverted back to my colored signature!! Just something cool I found that hopefully someone finds helpful.