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[Home](/)[Docs](/docs)Deliverability & inbox placement

Deliverability

Copy page[.md](/docs/deliverability.md "Open this page as Markdown")

# Deliverability & inbox placement

Updated 6 Sep 2026

On this page 4 sections

-   [What we handle for you](#what-we-handle-for-you)
-   [Your side of the deal](#your-side-of-the-deal)
-   [Check where you stand](#check-where-you-stand)
-   [Common questions](#common-questions)
-   [Do I need to set up SPF, DKIM and DMARC myself?](#do-i-need-to-set-up-spf-dkim-and-dmarc-myself)
-   [What is new-domain warm-up?](#what-is-new-domain-warm-up)
-   [Why does my domain have to be verified before I can send?](#why-does-my-domain-have-to-be-verified-before-i-can-send)
-   [Can SuperMailOS guarantee inbox placement?](#can-supermailos-guarantee-inbox-placement)

Deliverability is the reason SuperMailOS exists. Because we run the mail server, the technical work that decides whether your mail reaches the inbox is ours to carry — you get the result without operating any of it.

## What we handle for you

-   **DKIM on every message.** Each outgoing message is cryptographically signed with a key whose public half is published in your DNS.
-   **SPF and DMARC from the server’s zone.** Generated for your domain, not templated, and verified live before sending is allowed.
-   **DMARC reports, parsed.** Aggregate reports are collected and turned into a dashboard, so you can see every source sending as your domain instead of reading raw XML.
-   **New-domain warm-up.** Volume ramps automatically as a new domain builds reputation, rather than spiking on day one.
-   **Sending-IP reputation & reverse DNS.** The outbound IPs are monitored for blocklist status and correct PTR records.
-   **Encrypted delivery.** Mail between our servers and others travels over TLS whenever the other side supports it, and our own domain (supermailos.com) enforces MTA-STS.

## Your side of the deal

A few habits keep the reputation we manage healthy:

-   **Verify before you send.** If you signed up with an external address, confirm it — verified-before-send protects the shared sending reputation, so it’s on by default.
-   **Send mail people asked for.** SuperMailOS is person-to-person business email, not a bulk blaster. Unsolicited bulk sending is the fastest way to wreck placement for everyone, so it isn’t the product for that.
-   **Keep your lists clean.** Repeated bounces and spam complaints are the loudest negative signals a receiver sees. Remove addresses that bounce and honour unsubscribes immediately.
-   **Be consistent.** A stable from-address that people recognise and reply to builds the engagement history receivers reward.

## Check where you stand

The free [email deliverability checker](/tools/email-checker) looks up your SPF, DKIM, DMARC, MX and MTA-STS records and explains any gaps. To go deeper, read [why emails land in spam](/learn/why-emails-land-in-spam) and [email warm-up explained](/learn/email-warmup-explained).

## Common questions

### Do I need to set up SPF, DKIM and DMARC myself?

No. SuperMailOS generates them from the mail server's own zone, publishes them (one click on supported DNS providers, copy-paste elsewhere), verifies them live before you can send, and signs DKIM on every message. DMARC aggregate reports are parsed into a dashboard for you.

### What is new-domain warm-up?

New sending identities have no reputation, so a sudden burst looks suspicious to receivers. Warm-up ramps volume gradually as your domain establishes a track record. On SuperMailOS this runs automatically from your first message.

### Why does my domain have to be verified before I can send?

Sending from a half-configured domain fails authentication and teaches receivers to distrust you. SuperMailOS blocks sending until your records verify, which protects both your reputation and the shared sending infrastructure.

### Can SuperMailOS guarantee inbox placement?

No honest provider can guarantee placement — receivers make the final call using signals like engagement and complaint rates. What we do is remove the technical causes of spam foldering and monitor the reputation signals continuously.

Next: [secure your account with 2FA](/docs/security) or [migrate your existing mail](/docs/migrate).

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