How Substack does email marketing
SaaS & Tech5 campaigns · www.substack.com · RSS
The app for independent voices
Substack sends about 1.2 campaigns a week. Its median subject line runs 33 characters.
- Campaigns a week
- 1.2
- Median subject
- 33 chars
- Median words
- 2,140
- Carry a promo code
- 0%
What Substack sends
Mostly Newsletters (40% of campaigns).
The stack behind the sends
Substack sends with Substack and publishes a DMARC reject policy.
Sends with
Substack
Domain authentication
Mail failing authentication is rejected outright, the strictest setting.
SPF also authorizes Google Workspace, Mailgun to send as this domain, which usually means other tools sit alongside the main platform.
A typical Substack campaign carries 2,140 words and 3 images.
How this is measured
Every figure comes from real Substack emails captured in Inbox Archive, not from a survey or a vendor report. Day and time charts appear once a brand has enough scheduled campaigns archived to plot them honestly. Compare against every brand we track, or browse Substack campaigns.