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Mailrelay vs Substack
Mailrelay: High-volume sending on a free plan. Substack: Writers making money doing the work they believe in. Same fact set for both, straight from each vendor's docs.
Mailrelay
- Free tier
- Free plan: 80,000 emails/mo, up to 20,000 contacts, support included
- Paid from
- EUR 48/mo (100,000 emails); prepaid packs from EUR 40 · pricing page
- Public API
- Yes docs
- MCP server
- No · No official or community Mailrelay MCP server found.
- Best for
- High-volume sending on a free plan
- Website
- https://mailrelay.com
Substack
- Free tier
- Free to publish, no subscriber cap
- Paid from
- No monthly fee; 10% of paid subscription revenue plus Stripe fees · pricing page
- Public API
- Yes docs
- MCP server
- Community · Community servers on GitHub only
- Best for
- Writers making money doing the work they believe in
- Website
- https://substack.com
Which one?
Mailrelay suits high-volume sending on a free plan. Substack suits writers making money doing the work they believe in. Pricing changes; the fact tables above link both vendors' live pricing pages. For the rest of the field, see Mailrelay alternatives, Substack alternatives, or the full table.