People you know are on Substack
It's easy to find your friends and see what they are reading and sharing.
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Substack promotes its platform as a community where users can find and connect with people they know. The company highlights that millions of smart readers are already on Substack, making it easy to discover what fellow readers are reading and sharing. Substack invites users to find their friends and start exploring.
What the raw message shows
From the headers
- Sent with
-
Substack
See it in the headers
Across Substack's email
- Sends
- About 1 a week
- DMARC
-
Enforced, reject
Mail failing authentication is refused.
The copy
48 words · under a minute to read · 1 button
People you know are on Substack
Substack is already home to millions of the world's smartest readers, including many people you already know. It's easy to find fellow Substack readers and see what they are reading and sharing in the Substack app.
Button Find my friends
The Substack team
The words as text: what a screen reader can follow, and all there is when images don't load.
What the headers say
Read from the message's own headers, as it arrived.
- Came from
-
mg-235-32.substack.com
· 159.135.235.32
Substack's sending servers
- SPF
- Pass for mg1.substack.com
- DKIM
-
- Pass signed by mg1.substack.com
- DMARC
-
Pass for substack.com
Policy: reject
- Unsubscribe
-
One-click
Meets the Gmail and Yahoo rule for bulk senders.
- Complaints
-
Feedback loop set up
Mailbox providers can report spam complaints straight back to the sender.
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As received, minus the delivery side: the archive's own addresses show as [recipient], its mail servers as [receiver], signatures are left out and unsubscribe links trimmed to their host.
Route
- Received Identifies Substack
- from mg-235-32.substack.com (159.135.235.32) by [receiver] (cloudflare) id iCDqSDbuqjRp for <[recipient]>; Thu, 09 Jul 2026 14:08:32 +0000
- Received
- by ec9facab4cc96d22bd5c12604a125b8cb4c51ae29ea2c0596d36f1b0bdddf825 with HTTP id 6a4fab604c80ec0a3200c9b4; Thu, 09 Jul 2026 14:08:32 GMT
Authentication
- Received-SPF Authentication result
- pass ([receiver]: domain of [recipient]@mg1.substack.com designates 159.135.235.32 as permitted sender) receiver=[receiver]; client-ip=159.135.235.32; envelope-from="[recipient]@mg1.substack.com"; helo=mg-235-32.substack.com;
- Authentication-Results Authentication result
- [receiver]; dkim=pass header.d=mg1.substack.com header.s=mailo header.b=lJ2gX+8I; dmarc=pass header.from=substack.com policy.dmarc=reject; spf=none ([receiver]: no SPF records found for [email protected]) smtp.helo=mg-235-32.substack.com; spf=pass ([receiver]: domain of [recipient]@mg1.substack.com designates 159.135.235.32 as permitted sender) smtp.mailfrom=[recipient]@mg1.substack.com; arc=none smtp.remote-ip=159.135.235.32
Platform
- X-Mailgun-Sid
- WyIxZjE3NCIsInN1YnN0YWNrQGluYm94YXJjaGl2ZS5vcmciLCIwNzJjN2IiXQ==
- X-Mailgun-Sending-Ip
- 159.135.235.32
- X-Mailgun-Batch-Id
- 6a4fab60aaaa641cec17e74b
- X-Mailgun-Tag
- contact-sync-lifecycle
- X-Mailgun-Variables
- {"category": "contact-sync-lifecycle", "email_generated_at": "1783606111959", "notification_type": "marketing", "subdomain": "www", "subject": "People you know are on Substack", "user_id": "527064826"}
Unsubscribe and feedback
- Feedback-Id
- no-post:cat-contact-sync-lifecycle:pub-0:substack
- List-Owner
- <mailto:…@substack.com>
- List-Url
- <https://substack.com/…>
- List-Unsubscribe
- <https://substack.com/…>
- List-Id
- <www.substack.com>
- List-Unsubscribe-Post
- List-Unsubscribe=One-Click
Message
- Sender
- [email protected]
- Mime-Version
- 1.0
- Subject
- People you know are on Substack
- From
- Substack <[email protected]>
- Message-Id Identifies Substack
- <[email protected]>
- Date
- Thu, 9 Jul 2026 14:08:31 +0000
- Reply-To
- Substack <[email protected]>
- Content-Type
- text/html; charset="utf-8"
- Content-Transfer-Encoding
- quoted-printable
More from Substack
All 16 emailsArchived for reference and commentary. Substack, its logos and content are the property of their respective owners; Inbox Archive claims no affiliation and has disabled all links. If you own this content and would like it removed, get in touch.