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SuperMail docs

Sending from a custom domain

Once a domain is verified, any address on it can be used as a From.

Add a send address

Settings → Domains → [domain] → Send addresses → Add. You’ll specify:

  • Local part (the part before the @): hello, you, blake, etc.
  • Display name: Blake Stacks, Acme Inc., etc.
  • Signature (optional; can also be set globally).

The address is available in the compose From picker immediately. Send attribution is logged per message - look at the “Sent from” footer in the reader to see which profile was used.

The send flow

  1. You compose a message with [email protected] as From.
  2. SuperMail sends the message for your domain.
  3. The message is signed for deliverability and sent to the recipient.
  4. A copy is stored in your Sent folder for that domain.
  5. Bounces and delivery issues appear in your inbox as notifications.

Reply behavior

When you reply to a message that was sent to [email protected], the compose From defaults to [email protected]. You can override with the From picker.

SuperMail remembers the From you actually used on each thread and offers it on subsequent replies.

Deliverability tips

  1. Warm up gradually. If your domain is brand new, start with lower-volume sends to personal contacts before blasting a newsletter.
  2. Set DMARC to p=none for the first 1-2 weeks, review aggregate reports, then tighten to p=quarantine.
  3. Don’t send from no-reply@ if you want replies - recipients’ mail clients hide no-reply senders.
  4. Use DMARC reports to confirm every legitimate sender (SuperMail, mailing-list tools, etc.) is aligned before tightening to p=reject.

What you can’t do

  • Newsletter-scale sends. SuperMail is a personal/small-business client, not a marketing platform. Sending is tuned for human mail volume, not broadcast campaigns. For newsletters, use a dedicated email service provider.
  • Spoof a domain you don’t own. The From address must be on a domain you’ve verified.