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BillionMail Mailboxes and Webmail: Create Users and Connect Outlook or a Phone

BillionMail isn't only for newsletters. It's a full mail server, so you can create normal mailboxes like

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[email protected]

or

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[email protected]

, read them in the built-in webmail, and connect them to Outlook, Thunderbird or your phone.

The mailboxes BillionMail creates for you
When you add a domain, BillionMail usually creates a few standard mailboxes such as

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postmaster@

,

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abuse@

,

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admin@

,

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noreply@

and

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support@

. Keep postmaster and abuse: other mail servers and blacklist operators send reports there, and some check that they exist. Read them now and then, or forward them to an address you read.

Step 1: Add a mailbox
Open Mailboxes and click Add Mailbox. Here's the form:


Enter the part before the @ and pick the domain under Email Address, then a Display Name. BillionMail suggests a random Password; keep it or use your own long one. Quota limit and Quota set how much mail it can hold, and User Type can stay on General User. Click Confirm. For many mailboxes at once, use Batch Add or Import; Export All gives you a list for your records.

Each mailbox has a status switch. Turning it off blocks logins without deleting the mail, which is useful when someone leaves.

Step 2: Get the login details
In the mailbox list, click Copy in the Login Info (WebMail / SMTP) column. You get something like:

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WebMail: https://mail.example.com/roundcube Username: [email protected] Password: ... POP service [ Address: mail.example.com Port: 110/995 ] IMAP service [ Address: mail.example.com Port: 143/993 ] SMTP service [ Address: mail.example.com Port: 25/465/587 ]

Be careful where you paste it: it contains the password.

Step 3: Use webmail
Open the WebMail address and log in with the full email address and password. This is Roundcube, a well-known open-source webmail. If the page doesn't load or login fails, see BillionMail webmail not working.

Step 4: Connect Outlook, Thunderbird or a phone
Most apps try to detect settings automatically. If that fails, choose manual setup and enter:

• Incoming (IMAP): server
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  mail.example.com
  , port 993, SSL/TLS.
  
• Outgoing (SMTP): server
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  mail.example.com
  , port 465 with SSL/TLS, or 587 with STARTTLS. Authentication on, same username and password.
  
• Username: always the full email address.
  

Pick IMAP, not POP. IMAP keeps mail on the server, so your phone, laptop and webmail all show the same thing. POP downloads mail to one device and is rarely what you want.

iPhone: Settings > Mail > Accounts > Add Account > Other > Add Mail Account, then choose IMAP. Android (Gmail app): Add account > Other > Personal (IMAP).

Ports must be open
For apps to connect, ports 993 and 465/587 must be open in aaPanel's Security page (or your firewall) and in your provider's cloud firewall. Port 25 incoming must be open too, or you won't receive mail from other servers at all. Check from your own computer:

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nc -vz mail.example.com 993 nc -vz mail.example.com 587

Security tips

• Use a different password for each mailbox, and change it if anyone leaves.
  
• A hacked mailbox gets used to send spam within hours, which damages your whole server's reputation. If you suddenly see thousands of messages in the queue from one account, disable it first and investigate after.
  
• For apps that only send (WordPress, scripts), create a separate mailbox. See WordPress email through BillionMail SMTP.
  

More BillionMail guides

• Send API for transactional email
  
• WordPress email through BillionMail SMTP
  
• Import contacts, groups and tags
  
• Email templates explained
  
• SMTP relay with Amazon SES, Brevo or Mailgun
  
• Campaign analytics explained
  
• IP warm-up plan
  
• Move from Mailchimp or Sendy
  
• Add a second sending domain
  
• Send your first newsletter · DNS setup explained · Deliverability testing
  

Applies to BillionMail 4.9, October 2026. Replace

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example.com

and

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mail.example.com

with your own domain and mail hostname. Menu names can change a little between versions.