- I'm not on my Mac right now, but perhaps there is a preferences option to send forwards as 'inline' or as 'attachments'? I switched to Thunderbird and know that this option exists. Hunt around for that regarding the message as an attachment option.
- Regarding the signature phenomenon, I agree with Frederick. If you use pictures or icons/logos, etc. they will be attachments. One workaround that I have used is to use an html signature. It's not the easiest thing in the world, but I'd be happy to share the method. In essence, you create an html file, and if you want to include a picture, you put it somewhere online and then reference it in the html document. When others receive the email, their mail program will be 'pointing' to an online picture, not an attachment that came with the email. Does that make sense? One thing to point out is that there are negatives with each method... on one hand, you can annoy people with little attachments/backgrounds/emoticons... on the other hand, many browsers or mail programs require the reader to 'show images' since the html is trying to grab an image off the internet to display in the message... your choice. I use html signatures and many of my co-workers have asked me to create html signatures for them as not to bog emails down with the company logo.
-John