# Use a .RU or .SU domain with Proton Mail

Canonical URL: https://xuid.ru/blog/ru-su-proton-mail/

Language: en

Published: 2026-10-29. Category: Domains.

Connect your .RU or .SU domain to Proton Mail, prepare your addresses, and check delivery before moving away from your old mailbox.

Your domain can give your project a permanent email address even when you change mailbox providers. Register the name through xUID, then connect its DNS to the email service you choose. You can keep your website with a different host.

This walkthrough follows Proton's published instructions, reviewed on 29 October 2026. It is a documentation-based guide; we haven't tested a live xUID domain in a Proton account.

## Get the domain and mailbox ready

xUID's [.RU and .SU registration](https://xuid.ru/domains/international-buyers/) starts at $50/year and $75/year respectively. Choose the registration identity before ordering. Base uses a shared identity; Private Identity is available for an additional fee. Your Proton subscription is a separate purchase.

Proton requires a paid plan for custom domains. You'll also need access to the DNS service named by your domain's current nameservers. If that service is Cloudflare, for example, you'll edit records there. See [Proton's custom-domain instructions](https://proton.me/support/custom-domain).

For an existing mailbox, write down every address people use, including aliases such as billing and support. Decide who receives each one. An address printed on old invoices can still bring in mail long after you stop advertising it.

## Connect the domain in Proton

1. In Proton, open **Settings → Domain names → Add domain** and enter your domain.
2. Copy the verification TXT record Proton supplies into your DNS service. Use the value from your account.
3. Return to Proton and check verification. Create the users and email addresses you need before changing MX records.
4. Add Proton's MX records using the priorities shown in its setup instructions. These records direct incoming mail to Proton.

The sequence above follows the [current setup guide](https://proton.me/support/custom-domain). Leave unrelated website records in place. A mail change shouldn't become an accidental website move.

## Finish the authentication settings

Add the SPF, DKIM and DMARC settings shown for your domain. They help receiving services check whether mail claiming to come from your domain is authorized. If a newsletter platform also sends on your behalf, account for it before replacing existing authentication settings. Proton explains the records and how to check them in its [anti-spoofing guide](https://proton.me/support/anti-spoofing-custom-domain).

## Bring over your messages and check delivery

Proton's [Easy Switch](https://proton.me/support/easy-switch) can import messages from providers that support IMAP. Review the selected folders and date range, then check the completed import against messages you expect to keep. Moving existing messages and routing future mail are separate tasks.

Send a message from your new domain address to an outside account and reply to it. Repeat that check for the addresses your team relies on. Check website contact forms too: they may send through a different service from your inbox.

Keep access to the old mailbox until you've checked both delivery and imported messages. If you're moving the website at the same time, use the [website and email migration checklist](https://xuid.ru/blog/move-website-and-email/) to keep the changes organized.

Choose the domain you want people to remember, then [compare its registration options](https://xuid.ru/domains/). Registration privacy and your mailbox provider's account settings serve different purposes; review both when setting up the project.