1 Signing in to webmail
One address, one login. Nothing to install.
webmail.legacymailbox.io →- Go to
webmail.legacymailbox.io - Enter your full email address (e.g.
info@yourdomain.com) as the username - Enter your password → sign in.
2 Using several mailboxes in one place
Own more than one address? Add them all and switch with one click — like switching Google accounts.
Add a mailbox
- Click your account name at the top → Add Account.
- Email — the other mailbox's full address.
- Password — that mailbox's password.
- Display Name — a label (optional).
- Click Add.
Switch between them
Click your account name at the top and pick another — no logging out. (You can also manage them under Settings → Accounts.)
3 Changing your password
- Go to mail.legacymailbox.io and sign in with your email + current password.
- Open your profile / user settings → change password, set a new one, save.
- Use the new password next time you sign in to webmail.
4 Phone & desktop apps (optional)
Prefer the Gmail app, Apple Mail, or Outlook? Add your mailbox as an IMAP account with these settings.
| Server | Port | Security | |
|---|---|---|---|
| Incoming (IMAP) | mail.legacymailbox.io | 993 | SSL/TLS |
| Outgoing (SMTP) | mail.legacymailbox.io | 587 | STARTTLS |
Username = your full email address. Password = your mailbox password. In the Gmail app: profile picture → Add another account → Other (IMAP), then switch accounts by tapping your picture.
5 Admins — adding a new email
Mailboxes are created by an administrator (no public sign-up). Here's the whole flow.
On an existing domain (already set up)
- Sign in as admin at mail.legacymailbox.io.
- Configuration → Mail Setup → Mailboxes → + Add mailbox.
- Pick the domain, enter the name-before-@, full name, password, quota → save.
- Done — it can sign in at webmail immediately.
On a brand-new domain
- Add the domain: Configuration → Mail Setup → Domains → + Add domain.
- Generate its DKIM key: Configuration → ARC/DKIM keys → select the domain → generate. Copy the
v=DKIM1;…value. - Create the mailbox(es) (as above).
- Point the domain's DNS to us — add these where the domain's DNS is managed:
| Type | Host | Value | Priority |
|---|---|---|---|
| MX | @ | mail.legacymailbox.io | 10 |
| TXT (SPF) | @ | v=spf1 mx ~all | — |
| TXT (DKIM) | dkim._domainkey | the DKIM value from step 2 | — |
| TXT (DMARC) | _dmarc | v=DMARC1; p=none; | — |
A record untouched.6 Troubleshooting
"Unauthorized" or a blank/error page
Make sure the address is exactly webmail.legacymailbox.io (a bare bookmark, not a long link). Hard-refresh with Ctrl/⌘ + Shift + R.
Can't sign in
Use your full email address as the username, and check the password. If it still fails, ask your administrator to reset it.
New domain not receiving mail yet
DNS can take a few minutes to an hour after it's set. The mailcow DNS checker (section 5) shows when everything is green.