Newsletters · Guide
Gmail bulk-sender requirements: check authentication and unsubscribe in a delivered email
Inspect a real delivered message, confirm the sender domain and both unsubscribe methods, then verify removal from future sends.
Newsletter growth, delivery and measurement
Check email delivery, evaluate referrals and measure whether subscribers keep reading.
Latest news
beehiiv failed referral verification: billing and subscriber removal are separate
Failed verification can affect referral billing without automatically removing the referred person from your list.
More newsletter articles
Newsletters · Explainer
Yahoo spam complaint rate: use inbox deliveries as the denominator
Yahoo’s stated threshold is below 0.3%. Divide complaints by inbox deliveries, not all messages sent.
Newsletters · Guide
SparkLoop referrals: why a qualified referral may still go unpaid
A referral can pass quality screening but miss payment if the buyer’s budget was exhausted when the referral arrived.
Newsletters · Explainer
Apple Mail Privacy Protection makes opens unreliable as a measure of reading
Background image loading can record an email open without showing that the recipient read the message.