Substack newsletter scheduling without manual copy-paste
Substack's native scheduler is fine for one-off newsletters but breaks for multi-platform content fanout. Mirgent feeds your blog RSS into Substack newsletter drafts, schedules Notes alongside Twitter / Bluesky / Threads, and keeps your publication active across channels.
Substack capabilities in Mirgent
Substack-specific automation that the native dashboard doesn't ship.
- Newsletter draft creation with title, subtitle, body, and image
- Notes scheduling (Substack's micro-blog format)
- RSS-to-newsletter pipeline with AI-formatted long-form drafts
- Cross-post Notes to Twitter / Bluesky / Threads
- Per-publication targeting (multi-publication writers supported)
Connect Substack
Substack requires a publication URL, set it during connection.
Install Chrome extension + log into your Substack
Open your publication's URL (yourname.substack.com) and log in. Mirgent picks up the session.
Set publication_url credential
Mirgent needs to know your publication URL to navigate to /publish/post. Add it in Settings → Substack → Publication URL.
Schedule your first newsletter
Composer's Substack tab supports newsletter drafts (long-form) and Notes (short-form). Newsletters require manual approval before sending, too high stakes to auto-publish.
Substack tactics in 2026
Substack's growth is now Notes-driven; newsletter cadence still matters but Notes are the discovery engine.
- Notes daily, newsletter weekly. Most growing Substacks ship 5-10 Notes/week + 1 newsletter.
- Cross-post Notes to Twitter / Bluesky, same content, multi-platform reach. Mirgent handles formatting per platform.
- Substack recommends restacking (Substack-native reposts), don't ignore this. Mirgent supports restacking via the Notes flow.
- Newsletter subjects matter more than copy. Mirgent's AI suggests 3-5 subject variants per draft; A/B test the high-stakes ones.
Substack FAQ
Why does Mirgent need my publication URL?
Substack's editor lives at
Can I post to multiple Substack publications?
Yes, each publication is a separate connection in Mirgent. Helpful for writers managing multiple newsletters or agencies running multiple client publications.
Does Mirgent send the email or just save the draft?
Newsletter sending requires explicit user click in Substack, Mirgent prepares the draft + schedules a publish-time but the final 'Send to subscribers' is gated for safety. Notes can post fully automatically.
What's the difference between Notes and a newsletter?
Notes = micro-blog (like Twitter), feed-discovery driven, no email send. Newsletter = long-form, email-driven, paid subscription gate optional. Both important; Notes for discovery, newsletters for revenue.
Cross-post your blog to Substack automatically
Free plan covers Substack. Newsletter writers: stop double-publishing manually.