Email marketing guru's alert!

Have you tried Google? After about a minute or so of research, I determined that it would appear that you've previously sent email from this send address which had a spamassassin score. This is what AWS is:

AutoWhitelist - Spamassassin Wiki

If you send mail in the future with lower scores, you will get a lower AWS. Note that Gmail doesn't use Spamassassin (as far as I can tell), so that AWS is irrelevant to why you go in the spam box there.

As for the HTML/Text thing, are you sure you're including the separate HTML and text versions of your email in aweber? It's possible that the spamassassin scorer where you've sent the email is configured wrong. I'd see if you can try scoring it somewhere else.

On that front, if aweber says it's multipart, it's got to be. That's not something they would flub. They've been around a long time. They send a lot of email and do tend to know what they're doing.

If you're unhappy with your delivery rates, try iContact. I've been using them with a client, and it works really well. Accordingly, it's also pretty expensive when you have bigger lists.

Or, you can stick with text only emails and use "what works" instead of what "looks professional". I don't mean that as a dig, I just mean what I said. If your concern is primarily getting into the inbox, tailor your efforts to meet that goal, rather than trying to focus on getting a pretty design.

EDIT: I misread your initial post when replying again - I see you get through to Gmail but not via Outlook. That means you're hitting the spamfilter at your ISP. Find out how they score spam and see what might be the cause. It could have nothing to do with what Spamassassin says at all. Still though, if text works, and HTML doesn't - stick with text.

No amount of fancy looks will be as valuable to you as actually getting the email delivered.

A couple of things...
1. Outlook - Depending on the version, it's installed with really high spam filters. You can change this, but keep in mind that most of your customers won't know how (most likely).
2. HTML vs. Plain Text - HTML emails will also impact deliverability in addition to getting your messages put in the spam folder. Given this, make sure that it's really necessary for your business.

Here are a few pointers if you are set on using HTML:

- Code email by hand to avoid unintentional coding problems that are inherent with HTML editing programs
- Keep the size of your HTML to a minimum and account for headers
- Make sure it's self-contained
- If you're using css, it needs to be inline
- Use HTML tables and avoid nested tables (no div tags)

And with regard to spam assassin, you can actually download from their site a list of all their triggers.