How to Set Up Mailbux Email in eM Client (Free Email Client for Windows & Mac)
Looking for a free, full-featured desktop email client that works beautifully with your Mailbux custom domain email? eM Client is one of the best options available for both Windows and Mac. It offers a modern interface, built-in calendar and contacts, and full support for IMAP, SMTP, CalDAV, and CardDAV — everything you need to get the most out of your Mailbux account.
In this guide, we will walk you through setting up your Mailbux email in eM Client from scratch, including calendar and contacts sync.
Why eM Client?
eM Client stands out among desktop email clients for several reasons:
- Free for personal use — supports up to 2 email accounts at no cost
- Modern, clean interface — feels polished and responsive, unlike some legacy clients
- Built-in calendar, contacts, and tasks — no need for separate apps
- Full protocol support — IMAP, SMTP, CalDAV, CardDAV, and even PGP encryption
- Available on Windows and Mac — with a consistent experience across both platforms
- Import tools — easily migrate from Outlook, Thunderbird, or other clients
If you have a Mailbux business email and want a desktop client that just works, eM Client is an excellent choice.
What You Will Need
Before starting, make sure you have:
- A Mailbux — Free unlimited business email hosting for your business. Sign up now with at least one custom domain email address (e.g., you@yourdomain.com)
- eM Client downloaded and installed from emclient.com
- Your email address and password (the ones you created in your Mailbux dashboard)
Step 1: Open eM Client and Add a New Account
Launch eM Client. If this is your first time opening it, the setup wizard will appear automatically. If you already have an account configured, go to Menu > Accounts > Add Account.
Select "Mail" as the account type, then choose "Other" (not Gmail, Outlook, etc.). This tells eM Client to use manual server settings, which is what we need for Mailbux.
Step 2: Enter Your Email Address
Type your full Mailbux email address — for example, hello@yourdomain.com. Click Next.
eM Client may attempt to auto-detect your server settings. If it does not find them automatically, it will prompt you to enter them manually. Either way, verify the settings match the values below.
Step 3: Configure Incoming Mail (IMAP)
Use these settings for receiving email:
| Setting | Value |
|---|---|
| Protocol | IMAP |
| Server | my.mailbux.com |
| Port | 993 |
| Security | SSL/TLS |
| Username | Your full email address |
| Password | Your email password |
IMAP keeps your email synchronized between eM Client and the Mailbux server, so messages you read, move, or delete on one device are reflected everywhere.
Step 4: Configure Outgoing Mail (SMTP)
Use these settings for sending email:
| Setting | Value |
|---|---|
| Server | my.mailbux.com |
| Port | 587 |
| Security | STARTTLS |
| Username | Your full email address |
| Password | Your email password |
Make sure "Use same credentials as incoming server" is checked if eM Client offers that option — it simplifies the setup.
Step 5: Verify and Complete Setup
Click Next or Finish. eM Client will test the connection to both the incoming and outgoing servers. If everything is configured correctly, you will see a success message and your inbox will begin syncing.
The initial sync may take a few minutes depending on how many emails you have. Once complete, all your folders, sent mail, and drafts will appear in the sidebar.
Setting Up Calendar Sync (CalDAV)
One of the best features of eM Client is its built-in calendar with CalDAV support. This lets you sync your Mailbux calendar directly into eM Client.
To add your Mailbux calendar:
- Go to Menu > Accounts, select your Mailbux account
- Click the "CalDAV" tab (or add a new CalDAV service)
- Enter the CalDAV URL:
https://my.mailbux.com/dav - Use the same email address and password as your mail account
- Click OK or Save
Your calendars will now appear in the eM Client calendar view. Events created on the Mailbux webmail or any other connected device will sync automatically.
Setting Up Contacts Sync (CardDAV)
To keep your contacts in sync between Mailbux and eM Client:
- Go to Menu > Accounts, select your Mailbux account
- Click the "CardDAV" tab (or add a new CardDAV service)
- Enter the CardDAV URL:
https://my.mailbux.com/dav - Use the same email address and password
- Click OK or Save
Your Mailbux contacts will now appear in the eM Client contacts section and stay synchronized across all your devices.
Troubleshooting Common Issues
"Authentication Failed" Error
Double-check that you are using your full email address (e.g., hello@yourdomain.com) as the username, not just the part before the @ sign. Also verify your password is correct — you can reset it from your Mailbux dashboard if needed.
"Cannot Connect to Server" Error
Verify the server hostname is exactly my.mailbux.com (not mail.mailbux.com or your own domain). Check that the ports are correct: 993 for IMAP and 587 for SMTP. Make sure your firewall or antivirus is not blocking these ports.
Emails Send but Are Not Received
Check your DNS records in the Mailbux dashboard. Your domain needs proper MX, SPF, DKIM, and DMARC records to deliver email reliably. Mailbux provides all the required DNS values during domain setup.
Calendar or Contacts Not Syncing
Ensure the CalDAV/CardDAV URL is exactly https://my.mailbux.com/dav. Some versions of eM Client may need you to remove and re-add the CalDAV/CardDAV service after initial setup. Also verify that your Mailbux plan includes calendar and contacts features.
Slow Initial Sync
The first sync can take several minutes if you have a large mailbox. This is normal — eM Client is downloading message headers and folder structures. Subsequent syncs will be much faster.
Tips for Getting the Most Out of eM Client with Mailbux
- Enable conversation view — eM Client groups related messages into threads, making it easier to follow discussions
- Set up email signatures — go to Menu > Settings > Mail > Templates and Signatures to create professional signatures
- Use the integrated search — eM Client has fast full-text search across all your Mailbux emails
- Enable notifications — configure desktop notifications so you never miss an important email
- Use keyboard shortcuts — eM Client supports customizable keyboard shortcuts for power users
Final Thoughts
eM Client is one of the best free desktop email clients available today, and it pairs perfectly with Mailbux custom domain email. With full IMAP support, CalDAV calendar sync, and CardDAV contacts, you get a complete communication suite without paying for a premium client.
The setup takes less than five minutes, and once configured, everything stays in sync across your devices. If you are looking for a Thunderbird alternative with a more modern feel, or want something lighter than Outlook, eM Client with Mailbux is an excellent combination.
Do not have a Mailbux account yet? Create your free account — you get 15 GB of storage, a custom domain, and full IMAP/SMTP access to use with eM Client or any email app you prefer.