Blog - One Two Three Send

How click tracking signals to Gmail that you’re a marketer

The wrapper around every link in your newsletter is teaching inbox providers to filter you out. The fix is one toggle.

There’s a tiny piece of metadata in every send that quietly tells half your audience the email isn’t for them.

Confirmation emails are the most under-considered part of a newsletter funnel. They are also where most growth leaks out.

Every bounce is a signal — but most operators read the wrong signal. Here’s what the bounce list is actually telling you.

Patterns Gmail’s algorithm catches faster than you do — and what to write instead.

How often you send is the single biggest lever you have on lifetime subscriber value. Most operators get it backwards.

Every HTML email carries a plain-text twin. Yours is probably empty — and Gmail notices.

Image-to-text ratio is one of the strongest spam signals there is. Here’s the threshold most operators cross by accident.

Mobile email reading is paragraph scanning, not reading. White space is the design system you didn’t know you had.

GDPR, CAN-SPAM, and a 2024 FTC update changed what every newsletter footer is required to contain. Most haven’t caught up.