Even when you’re sending permission email messages to subscribers who opted-in, your email can still be flagged as spam by overzealous spam filters which seem to be getting more and more aggressive with their spam flagging analyses. Simply using the word “free” in an email message can often land you in the spam heap. Excessive use of punctuation such as exclamation marks can also earn you a high spam rating.
Action plan? Run your email through some of the spam filters available online, or install some end-user antispam applications on your own computer, and send an email to yourself before attempting to email end users. Other strategies include avoiding the use of words like “Viagra” or mentioning certain anatomical features.
Along these lines, if you are authoring an article for your email newsletter and your name is Dick Jones, you should probably use a pseudonym to make sure that your email actually gets delivered.