Not coding "absolute paths" to their images. Remember, attaching graphics and using "relative paths" won't work. You need to host the images on your server, then link to them in your code.
Using JavaScript, or ActiveX, or embedding movies. That stuff just doesn't work in HTML email.
Getting over ambitious with designs. Designing HTML email isn't the same as designing web pages. You can't have all the CSS-positioning, DIVs, DHTML, and complex, embedded tables like you can in web pages.
Forgetting-or refusing-to include an opt-out link. It'sunprofessional not to allow recipients to unsubscribe from your list. Oh yeah, it's illegal, too. Be sure to read and understand The CAN-SPAM Act of 2003.
Linking to an external CSS file. You usually put CSS code in between the < >< > tags of web pages, right? But browser based email applications (like Yahoo, Hotmail, and Gmail) strip < > and < > tags from HTML email. Embed your CSS below the < > tag.
Letting your permission "grow cold." If you've been collecting opt-ins at your website like a good email marketer, but you haven't sent an email in several months, your subscribers have forgotten all about you. So when they receive a full blown email newsletter from you "out of the blue" they're going to click their "this is spam button" in their email application. Don't let your permission grow cold. Send occasional emails. If you've been collecting emails for years, and you're only just now sending your first email to everyone, you should send a little "re-invitation" to your list. At the very least, send an email and place some kind of text at the top that reminds them of where and when they opted in. People usually forget about opting-in to something after about 6 months or so.
Forgetting to test. Thoroughly. When you send HTML email, you've really got to test it in as many email applications you can. Then you have to test on different operating systems. Then different ISPs (we'll explain shortly). If you keep things simple, and build a rock solid, thoroughly tested template for each newsletter, you won't have to test so much. But you should always send at least a few campaigns to yourself before sending it out to your entire list.
Sending to a list without permission. This is the worst offense. Lots of "innocent" marketers, who "mean well" commit this heinous crime. Here are some common ways legitimate marketers can inadvertently become known as "evil spammers:"
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