Forståelse af en guide på engelsk

Hey alle.

Sidder lige og læser en e-bog om email marketing, og det eneste som jeg ikke forstår er:

"By default, some email applications start to wrap your plain-text messages at about 60 characters or so. That’s not really a big deal to most people. Just let your text wrap wherever their email programs want it to. But if you have content that you absolutely do not want to wrap unexpectedly (like in the middle of a hyperlink), one nice little trick is to type a letter 60 times across the top of your message, and use that as your visual “ruler.” As your content approaches the end of that ruler, hit your return key and “hard wrap” the line. Again, this is only if you want very strict formatting. These days, I let my plain-text emails just wrap fluidly."

Jeg kan godt oversætte det, men forstår stadig ikke helt meningen med det. Nogle der kan besvare?