Blog
Notes on sending, measuring and keeping a list
Deliverability, testing and list health for people who run newsletters — written by the team building Carrier Crow. RSS feed
deliverabilityauthenticationgmailyahoo
Gmail and Yahoo's bulk sender rules, in plain English
What Gmail and Yahoo have required of bulk senders since February 2024, what breaks if you miss a rule, and how to check your own setup.
· 6 min read
retentionanalyticssurvival-analysis
How long do your subscribers really stay?
Averaging how long departed subscribers lasted makes your list look fickle. Survival analysis counts everyone, including the people still here.
· 5 min read
sponsorshipab-testingstatistics
Is your sponsor's A/B test result real?
Why 4.1% against 3.8% on a few hundred impressions is noise, and how to tell a real difference between two sponsor creatives from luck.
· 5 min read