With some simple rules you can sort out the mail showing these flaws as spam. All of the following rules apply to the header as well. The infamous time zone flaw in StealthMailer allows nice filtering. Again, fewer spammers than you might expect change this. As far as I know, Pegasus is the only legitimate email client that uses this feature.
Spammers seem to love it.
Finally Finally, you can file all mail not sent directly to you into the folder containing spam or the trash can . Its sender may have done some research and you may really be interested in what they have to offer. The leader in low-cost press release distribution, targeting to journalists in your industry at no additional cost. In Email Lists Your TOP resource for highly targeted optin email lists. Receive free consultation and select from over 36,000 mailing, telemarketing and e-mail lists.