Quick summary: Email I send ends up in people's junk folders. How do I prevent this?

Details:
I use Mac Mail. In my signature I have my logo and another small image, both are .jpg's. My email address is @colinmichaelphoto.com but my outgoing server is through my isp or through gmail (I have the same issue regardless of which I use but I ISP is blacklisted so it is probably a bit worse than gmail, plus I have had several people say they haven't even gotten mail I send through my ISP).
When I send through my isp people only see my @colinmichaelphoto.com address but when I use google it sometimes says my google address and my @colinmichaelphoto.com address, which is lame. My website is hosted by big folio.
Anyone know what I can do to prevent this? I don't want to take my images out of my signature unless I absolutely have to.
Thanks in advance.

Well, even though people only see your colinmichaelphoto.com address, the full headers will show that it is coming through somewhere else, which can contribute to spam categorization, I believe.

Do you have webmail access for colinmichaelphoto? If so, can you send messages from there without it being tagged as spam? If not, can they get it for you? Can you not set your outgoing server to be that? I would start there....

I just spent the last 45 minutes on the phone with my sister emailing back and forth to figure out what is triggering the filter. Her office is on one of the most strict filters so it was a pretty good place to test.
Turns out that two things were triggering it. The first was the name of my image, it was 1header3small.jpg, I changed it to Becky.jpg. The other thing was that I had web addresses in my signature that go to my website. Once I took them out and renamed the image it works fine. Weird, but I thought I would pass it on so that all of you who have your web address in your signature.
I sure hope this is the end of this issue for me!

I have web addresses, but they aren't links, most mail readers convert them to links on their end...

Is that what you had? Or did you have complete links in the sig? Did you get rid of the links altogether? That doesn't sound like a great solution to me.

I use Gmail and I know what you mean about it sometimes showing my gmail address in the from, it depends on the email program that the receiver is using. Since I so constantly use two computers, the upsides of Gmail have outweighed that small quirk...

Hey Bill,
Either way it was blocking them. I just counted 24 variations that we tried so we could narrow the problem down
I had to take them out all together. I tried sending through gmail like you suggested but it still had the same issue.
Kind of a bad solution but at least my email is getting through...

Ok, I was wondering this too... my email always ends up in peoples spam box. Thanks for bringing this up. I'll take out my email address to....

Can you put it in some other way like this?
www(dot)kairdouma(dot)com
I have seen people do that, but never new why, maybe this is the reason?
What about phone numbers?
I currently don't have a header on my emails, so I think i am all set there....

I played around and found that the (dot) was works as does not including the www.
I now have Web: colinmichaelphoto.com and it gets through every time.
This stuff is so frustrating, nothing worse than not knowing why a client didn't get back to you!

Good tip. I'll take the WWW out of mine too. I haven't noticed that problem, but it's better to do whatever to lessen the chances of getting 'filtered' out of clients inboxes.

Thanks :-)