How to Set Up Mail Seru Email in eM Client (Free Email Client for Windows & Mac)
Looking for a free, full-featured desktop email client that works beautifully with your Mail Seru 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 Mail Seru account.
In this guide, we will walk you through setting up your Mail Seru 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 Mail Seru 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 Mail Seru — 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 Mail Seru 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 Mail Seru.
Step 2: Enter Your Email Address
Type your full Mail Seru 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 | mailserver.mailseru.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 Mail Seru 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 | mailserver.mailseru.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 Mail Seru calendar directly into eM Client.
To add your Mail Seru calendar:
- Go to Menu > Accounts, select your Mail Seru account
- Click the "CalDAV" tab (or add a new CalDAV service)
- Enter the CalDAV URL:
https://mailserver.mailseru.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 Mail Seru webmail or any other connected device will sync automatically.
Setting Up Contacts Sync (CardDAV)
To keep your contacts in sync between Mail Seru and eM Client:
- Go to Menu > Accounts, select your Mail Seru account
- Click the "CardDAV" tab (or add a new CardDAV service)
- Enter the CardDAV URL:
https://mailserver.mailseru.com/dav - Use the same email address and password
- Click OK or Save
Your Mail Seru 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 Mail Seru dashboard if needed.
"Cannot Connect to Server" Error
Verify the server hostname is exactly mailserver.mailseru.com (not mail.mailseru.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 Mail Seru dashboard. Your domain needs proper MX, SPF, DKIM, and DMARC records to deliver email reliably. Mail Seru provides all the required DNS values during domain setup.
Calendar or Contacts Not Syncing
Ensure the CalDAV/CardDAV URL is exactly https://mailserver.mailseru.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 Mail Seru 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 Mail Seru
- 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 Mail Seru 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 Mail Seru 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 Mail Seru is an excellent combination.
Do not have a Mail Seru account yet? Create your free account — you get 7 GB of storage and a custom domain. To connect eM Client over IMAP/SMTP, you will need a paid Mail Seru plan (the free plan uses webmail and the Mail Seru apps).