Help / Custom domains

Using uMail with Resend, SendGrid or other sending services

uMail sits next to the services you already use. Nothing of theirs is removed.

Many companies send mail from more than one place. A website may send receipts through Resend or SendGrid. Your team may use Google Workspace or Microsoft 365. uMail is built to sit next to them. When you connect your domain, uMail reads what is there now, keeps it, and adds itself.

What uMail does for you

• It keeps the settings of your other services. Your website mail, newsletters and receipts keep working.
• It adds uMail to your list of allowed senders. Everyone already on the list stays.
• If you already have a rule for mail that fails the checks, uMail keeps it. It never makes it weaker. You can choose to also get the reports.
• It never replaces something it did not create.
• Your inbox is the one thing that moves. It only moves after you agree, and you can import your old mail first.

See the plan before anything changes

Open your domain and choose What will change. It reads your settings live and lists what uMail keeps, adds and changes, in plain words. If you add the settings yourself, it shows the exact values, already merged with yours, with a copy button on each.

Move your inbox last

Step 1 is safe. Mail keeps arriving where it does now. Step 2 moves your inbox to uMail. Before you do it, go to Settings, then Import mail, and bring your old mail with you. Your old mailbox stays as it is.

See who sends as your domain

Choose Who sends as your domain to see the services we recognise from your settings. When mailbox providers send us their reports, you also see how much mail each sender sent and whether it passed. We only show what we can know. A service that leaves no trace in your settings does not show up.

If something changes later

Once a day, at night, uMail checks that its settings are still in place. If another tool removed uMail from your list of allowed senders, or moved your inbox, you see a notice at the top of the admin pages with a way to fix it. You can also undo any change uMail made.

For your developer: uMail merges into your single SPF record and counts its DNS lookups, warning at 10. It uses its own DKIM selectors, never a common name such as default or mail. It never touches the records of other services, for example the send. subdomain or the selectors of Resend, SendGrid, Mailgun or Postmark. Existing DMARC is kept, and only the rua address is added if you agree.

If your sender list is too long, move bulk senders such as newsletters to a subdomain, for example news.yourcompany.com. uMail does not shorten the list for you.