Atlas.cz Email Settings 2026 (centrum.cz): SMTP, POP and IMAP

IMAP, POP3 and SMTP Integration into Gmail

Configure Gmail with external IMAP/POP3/SMTP to send/receive emails from your custom domain through Gmail’s interface. Perfect for professionals managing multiple accounts in one place.

1. Google Account → Security → App passwords (2-Step Verification must be enabled).
2. Generate App Password for “Mail” → copy 16-character password.
3. Gmail → Settings → See all settings → Forwarding and POP/IMAP.
4. Enable IMAP → Save Changes.
5. Incoming (IMAP): [IMAP SERVER]:993 SSL | Outgoing (SMTP): [SMTP SERVER]:587 STARTTLS.
6. Use your full email + App Password (not regular password) for authentication.

✅ Gmail Result: Send/receive custom domain email directly in Gmail interface with full search/folder integration.

WordPress SMTP Plugin Configuration (WP Mail SMTP + MailPoet)

Configure SMTP in WordPress to fix email delivery issues and prevent spam folder placement. WP Mail SMTP and MailPoet ensure reliable transactional emails, contact forms, and newsletters deliver successfully.

1. Install and activate WP Mail SMTP or MailPoet plugin from your WordPress dashboard.
2. Navigate to WP Mail SMTP → Settings or MailPoet → Settings → Sending tab.
3. Select “Other SMTP” as your mailer method from the dropdown.
4. Enter SMTP settings with Port 587 and STARTTLS encryption (when available).
5. Input your full email address and password in the authentication fields.
6. Click Save Settings and send a test email to verify the configuration works.

✅ Result: WordPress contact forms, user registrations, and newsletter emails now deliver reliably via your SMTP server.

This configuration includes these plugins and tools within WordPress:

• HappyForms
• Elementor Forms
• Gravity Form
• WooCommerce Checkout Form
• Contact Form by BestWebSoft
• Fluent Forms
• Contact Form 7
• WPForms
• Ninja Forms
• Default WordPress Reg Form
• Forminator Forms
• Formidable Form
• WordPress Comment Form
• Mail Mint Form

Thunderbird OAuth2 Email Setup (IMAP + SMTP)

Secure IMAP & SMTP using OAuth2 token authentication in Thunderbird. This modern method eliminates password storage for enhanced security.

1. Open Thunderbird → Account Settings → Account Actions → Add Mail Account.
2. Enter your email address and click Continue to begin setup.
3. Select IMAP protocol and choose OAuth2 authentication method.
4. Thunderbird opens a browser window → log in to your provider → Grant access permissions.
5. Automatic configuration applies: Incoming: use the IMAP server address from the settings table above, port 993, SSL
6. Click Done → Thunderbird begins syncing folders and emails immediately.

OAuth2 advantage: Token-based authentication enhances security over traditional password methods while maintaining full functionality.

Outlook IMAP, POP3 & SMTP Setup (Auto + Manual)

Outlook configuration supports both automatic server detection and manual IMAP/POP3/SMTP settings for complete control over your email setup.

🔄 Auto Setup (Recommended):

1. Go to File → Add Account → Enter your email address + password.
2. Outlook automatically detects IMAP, POP3, and SMTP server settings.
3. Click Connect → setup completes in approximately 30 seconds.

⚙️ Manual Setup (Advanced Users):

• Authentication: Use your full email address + password for both servers

BlueMail Two-Factor Authentication + OAuth2 Setup

BlueMail security setup combines OAuth2 authentication with two-factor authentication (2FA) for maximum account protection.

1. Open BlueMail → Account Settings → Security → Enable Two-Factor Authentication.
2. Link your phone number or authenticator app for 2FA verification codes.
3. Add email account → Choose OAuth2 or manual server configuration.
4. Enter server details from the table above
5. Complete login with 2FA code → enhanced security layer activated.

Apple Mail IMAP Configuration (iCloud + Manual)

Setup IMAP in Apple Mail for seamless synchronization across Mac, iPhone, and iPad devices with full folder support.

1. Open Apple Mail → Mail → Add Account → Other Mail Account.
2. Enter your name, email address, and password → click Continue.
3. Select IMAP account type → Incoming server.
4. Next: Outgoing server
5. Click Sign In → Mail verifies settings and begins folder synchronization.

iOS Mail App Setup (iPhone/iPad)

iPhone/iPad Mail configuration syncs IMAP folders across all Apple devices with native push notifications.

1. Go to Settings → Mail → Accounts → Add Account → Other.
2. Enter name, email, password → Next.
3. Account Type: IMAP → Incoming: [IMAP SERVER] Port 993 SSL.
4. Enter your outgoing SMTP server and port.
5. Next → Save → iOS verifies and syncs immediately.

Push enabled automatically: new emails appear instantly on Lock Screen.

Android Mail App Configuration

Android Gmail/Email app setup works with any IMAP/SMTP provider for native device integration.

1. Go to: Settings → Accounts → Add Account → Email (or Gmail app).
2. Enter email + password → Next.
3. Account Type: IMAP
4. Outgoing server details → Require authentication.
5. Next → Sign In → Android syncs contacts/calendar if enabled.

Sync interval: 15min default (battery optimized) – change in Account Sync settings.

eM Client Manual IMAP & POP3 Sync Configuration

Configure your email settings on eM Client with either automatic setup or through precise IMAP/POP3 server settings for reliable email synchronization and full folder support.

1. Click New Account → Mail
2. Authentication requires full email address + password for both incoming and outgoing servers.
3. Click Next → Finish → Send/Receive All Folders to begin synchronization.

Mailbird OAuth2 IMAP & SMTP Integration

Secure Mailbird setup using OAuth2 authentication eliminates password storage while providing full IMAP/SMTP functionality.

1. Mailbird → Add Account → Enter your email address to begin.
2. Choose Manual Setup → OAuth2 authentication method from options.
3. Browser opens your provider’s login page → enter credentials → Authorize Mailbird.
4. Mailbird receives access token and automatically configures IMAP/SMTP servers.
5. Setup completes → full email synchronization begins automatically.

Mailspring OAuth2 IMAP Configuration

Mailspring OAuth2 setup provides secure email access without storing passwords directly in the application.

1. Add new email account → Select Custom IMAP configuration option.
2. Incoming IMAP SERVER and outgoing SMTP SERVER.
3. Mailspring prompts OAuth2 authorization via browser window for secure login.
4. Log into your provider account and grant Mailspring access permissions.
5. Mailspring automatically manages authentication tokens → seamless email access established.

Postbox Manual IMAP Synchronization

Postbox IMAP setup with manual synchronization control for precise email folder management and immediate updates.

1. Add IMAP account → Enter IMAP Server details.
2. Outgoing SMTP with full email authentication.
3. Postbox connects and displays folder structure automatically.
4. Right-click any folder → Get Messages for immediate manual synchronization.
5. Manual sync updates local mailbox instantly with server changes (read status, deletions, organization).

SendBlaster SMTP Configuration (Bulk Email)

Bulk email SMTP configuration in SendBlaster requires precise server authentication for reliable campaign delivery.

1. Open SendBlaster → Settings → SMTP Configuration section.
2. Enter SMTP Server and Port: do not forget to Enable TLS encryption.
3. Authentication: Your full email address + password (required).
4. Click Test Connection → verify green success indicator appears.
5. Save settings → SendBlaster ready for bulk email campaigns and newsletters.

MailJerry IMAP Real-Time Synchronization

MailJerry IMAP setup enables real-time access to email folders stored on your provider’s server across all devices.

1. Incoming Server and encryption required.
2. Authentication: Full email address + password for secure connection.
3. Enable real-time folder synchronization settings in MailJerry preferences.
4. Folders update instantly with new messages, read status, and deletions across devices.

Clean.email OAuth2 Synchronization Setup

Clean.email OAuth2 setup provides secure mailbox access without sharing passwords directly with the application.

1. Add new account → Select OAuth2 authorization method.
2. Your provider opens login portal → enter credentials securely.
3. Grant Clean.email permissions for email read/write access.
4. OAuth2 token enables real-time message management, filtering, and organization.
5. Setup complete → Clean.email maintains secure, ongoing mailbox synchronization.

Common IMAP/POP3/SMTP Troubleshooting

• Authentication failed: Always use your complete email address, never just the username portion.
• Port blocked by ISP: Try alternative SMTP port as fallback.
• SSL certificate errors: Ensure certificate validation is enabled in client settings.
• Slow or no IMAP sync: Check folder subscriptions and enable all folders in client settings.

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