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Legacy Mailbox — Help & Setup

Everything you need to use your company email.

✅ The easiest way to use your email

Just sign in with your email address + password — nothing else to set up. Pick whichever you like:

🌐
In your browserGo to webmail.legacymailbox.io on any phone or computer. Nothing to install.
🐦
Or the Thunderbird appFree (Windows/Mac) from thunderbird.net. Add your email + password → it sets itself up. Best desktop option.

These two just work — no server settings, no ports, nothing technical. (Outlook & Apple Mail can be fussy; see section 4 if you must use them.)

1 Signing in to webmail

One address, one login. Nothing to install.

webmail.legacymailbox.io →
  1. Go to webmail.legacymailbox.io
  2. Enter your full email address (e.g. info@yourdomain.com) as the username
  3. Enter your password → sign in.
💡 Bookmark webmail.legacymailbox.io exactly. There are no ports or server settings to enter — just email and password.

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

  1. Click your account name at the top → Add Account.
  2. Email — the other mailbox's full address.
  3. Password — that mailbox's password.
  4. Display Name — a label (optional).
  5. 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

  1. Go to mail.legacymailbox.io and sign in with your email + current password.
  2. Open your profile / user settings → change password, set a new one, save.
  3. Use the new password next time you sign in to webmail.
💡 mail.legacymailbox.io is the account-settings site. Day to day you only need webmail.legacymailbox.io.

4 Desktop app — use Thunderbird

Want a proper desktop app? Use Thunderbird (free, Windows & Mac). It sets itself up from just your email + password — no server settings to type, for any of our domains.

Thunderbird (recommended)

  1. Download free from thunderbird.net and install (one time).
  2. Add account → enter your name, email, and password.
  3. You'll see “Configuration found” — click Continue / Done. That's it.
💡 After the one-time install, every mailbox you add is just email + password — Thunderbird finds the server itself. This is the easiest desktop option by far.

Outlook / Apple Mail (only if you must)

These apps often don't auto-detect and will ask for server settings. If so, enter the servers below (both are mail.legacymailbox.io). On iPhone/iPad, the built-in Mail app usually auto-detects from email + password.

Outlook (Windows/Mac)

  1. File → Add Account (or Outlook → Settings → Accounts → +).
  2. Type your email address → Connect.
  3. Type your password → Connect. It configures itself.

Apple Mail (Mac) / iPhone / iPad

  1. Mac: Mail → Settings → Accounts → +. iPhone/iPad: Settings → Mail → Accounts → Add Account.
  2. Choose Other → Add Mail Account.
  3. Enter your name, email, and password → Next. It finds the settings for you.

Gmail app (Android/iPhone)

  1. Tap your profile picture (top-right) → Add another account.
  2. Choose Other → enter your email → Next → Personal (IMAP) → enter password.
  3. Switch between accounts anytime by tapping your profile picture — just like Google accounts.
💡 If an app ever asks for server details manually, use the settings below.
ServerPortSecurity
Incoming (IMAP)mail.legacymailbox.io993SSL/TLS
Outgoing (SMTP)mail.legacymailbox.io587STARTTLS

Username = your full email address. Password = your mailbox password.

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)

  1. Sign in as admin at mail.legacymailbox.io.
  2. Configuration → Mail Setup → Mailboxes → + Add mailbox.
  3. Pick the domain, enter the name-before-@, full name, password, quota → save.
  4. Done — it can sign in at webmail immediately.

On a brand-new domain

  1. Add the domain: Configuration → Mail Setup → Domains → + Add domain.
  2. Generate its DKIM key: Configuration → ARC/DKIM keys → select the domain → generate. Copy the v=DKIM1;… value.
  3. Create the mailbox(es) (as above).
  4. Point the domain's DNS to us — add these where the domain's DNS is managed:
TypeHostValuePriority
MX@mail.legacymailbox.io10
TXT (SPF)@v=spf1 mx ~all—
TXT (DKIM)dkim._domainkeythe DKIM value from step 2—
TXT (DMARC)_dmarcv=DMARC1; p=none;—
💡 Use mailcow's DNS checker: in Mail Setup → Domains, each domain has a DNS diagnostics view listing every record with a green ✓ / red ✗. Add records, refresh, watch them go green — no need to memorize anything. Leave any website 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.