The only reason two-spaces ever came about was due to the use of monospace fonts. Unless you’re making a point of sending your fonts using a monospace font, stick to single spaces.

Thanks for sharing some real data. I’m not a statistician (and have blissfully forgotten the courses I took in the Uni), but the differences seem so small that this might just be due to random variation. Did you check if this is statistically meaningful result?

What do you mean?

We never run the same articles on any site.

I unsubscribed to this newsletter. Not because I didn’t like the layout. I actually MUCH prefer it to the narrow layout in your SocialTriggers newsletter.

I unsubscribed because I’m receiving the same information from DIYThemes, SocialTriggers, and The Thesis Statement. 🙂

Each email was sent to more than 4,000 people.

Eg, this difference may be statistically meaningless unless the sample size is quite large.

thank you,
Stephen

He ran two tests.

Emails 1-3 were testing for width only.

Email 3 and 4 tested font size.

You can run both of the same tests at the same time as you’ve always got a control for both, which in this case is email 3.

Nope, what you do is isolate a segment of people with your behaviour and then test again.

Segmenting your list is something every competent email marketer should be doing.

I agree. I strongly dislike and disagree with the new movement (and it’s not just here) to remove timestamps from everything in an attempt to trick Google into thinking your content (or comments) are evergreen. Users come first, and if your users don’t know when something was written, they will distrust the advice or content – as well they should.