Have a segregated group? Offer relevant content nevertheless
Relevant content is essential to ensuring that you treat your site's visitors well. Regardless of how diverse your e-mail groups are, it's essential that you still cater to their unique interests and needs. Check your content because this is how you'll win their hearts and loyalty.
Always offer a selection
Variety makes for an interesting blog or website. Even if your site has a theme, make sure you offer other content that may be directly or indirectly related to the main subject.
Political correctness may be overrated for some but politeness is here to stay. Always treat visitors that come from e-mail groups with respect. Avoid writing insults or leering comments. Remember that people are entitled to their own opinions and their right to express themselves is protected by the law.
You may not agree with what they say but hey, it's a democracy. And that's exactly the reason why you enjoy the privilege of maintaining your own website in the first place. So lighten up and treat your visitors with respect. Who knows? You could even build a stronger e-mail group list in the process.