Reading time: 6 min · Last verified: July 2026 · SMTPedia editorial team
Juno is a US legacy dial-up ISP operated by United Online (which also runs NetZero). The email service continues to operate for existing subscribers and for premium email-only tiers. Standard IMAP, POP3, and SMTP with SSL/TLS are supported on juno.com hostnames. New signups typically flow through the Juno Turbo or Juno Platinum tiers rather than the free tier.
Juno historically required a paid tier (Juno Platinum) for third-party mail client access via SMTP/IMAP/POP3. The free Juno accounts remained limited to the Juno client software. Current policy varies by grandfathered plan, so verify your tier before troubleshooting authentication errors: an “invalid password” from smtp.juno.com may actually mean your account tier lacks SMTP relay authorization. Reference: SMTP 550 5.7.1 guide.
Quick Reference: Juno Server Settings
Configure the mail client with the values below. Third-party client access typically requires a paid Juno tier.
| Protocol | Server | Port | Encryption | Authentication |
|---|---|---|---|---|
| SMTP (outgoing) | smtp.juno.com | 465 (SSL) or 587 (STARTTLS) | Required | Full email + password |
| IMAP (incoming, recommended) | imap.juno.com | 993 (SSL) or 143 (STARTTLS) | Required | Full email + password |
| POP3 (incoming, single device) | pop.juno.com | 995 | SSL/TLS | Full email + password |
Juno SMTP Settings (Sending Mail)
SMTP handles outbound mail. Use smtp.juno.com on port 465 with SSL/TLS or 587 with STARTTLS. Authentication uses your full user@juno.com address and your Juno account password.
If SMTP authentication succeeds but delivery fails or is slow, note that Juno’s outbound reputation on the shared IP pool has degraded over the years as the platform aged. Delivery to major providers (Gmail, Outlook.com, Yahoo) is generally reliable but can be flaky for smaller destinations. For any transactional or bulk mail need, use a dedicated relay service.
Juno IMAP Settings (Recommended for Reading)
IMAP synchronizes message state across all configured devices. Use imap.juno.com on port 993 with SSL/TLS or 143 with STARTTLS. Same credentials as SMTP.
Standard IMAP folders (INBOX, Sent, Drafts, Trash) auto-populate on most clients. If your legacy account was originally configured for the Juno client software, expect a folder migration on first IMAP connection: some folders may take a full sync cycle to fully appear.
Juno POP3 Settings (Single-Device Access)
POP3 downloads mail to a single device. Use pop.juno.com on port 995 with SSL/TLS. Same credentials as SMTP and IMAP.
POP3 with “Leave messages on server” enabled is a reasonable archival strategy for long-time Juno users concerned about the platform’s long-term future: download mail to a local Thunderbird or Outlook profile as a backup while keeping the server copy in place. Given the legacy US ISP context, planning for eventual migration is prudent.
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.
- Google Account β Security β App passwords (2-Step Verification must be enabled).
- Generate App Password for “Mail” β copy 16-character password.
- Gmail β Settings β See all settings β Forwarding and POP/IMAP.
- Enable IMAP β Save Changes.
- Incoming (IMAP):
[IMAP SERVER]:993 SSL| Outgoing (SMTP):[SMTP SERVER]:587 STARTTLS. - Use your full email + App Password (not regular password) for authentication.
β 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.
- Install and activate WP Mail SMTP or MailPoet plugin from your WordPress dashboard.
- Navigate to WP Mail SMTP β Settings or MailPoet β Settings β Sending tab.
- Select “Other SMTP” as your mailer method from the dropdown.
- Enter SMTP settings with Port
587and STARTTLS encryption (when available). - Input your full email address and password in the authentication fields.
- Click Save Settings and send a test email to verify the configuration works.
β 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.
- Open Thunderbird β Account Settings β Account Actions β Add Mail Account.
- Enter your email address and click Continue to begin setup.
- Select IMAP protocol and choose OAuth2 authentication method.
- Thunderbird opens a browser window β log in to your provider β Grant access permissions.
- Automatic configuration applies: Incoming: use the IMAP server address from the settings table above, port 993, SSL
- Click Done β 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.
π Auto Setup (Recommended):
- Go to File β Add Account β Enter your email address + password.
- Outlook automatically detects IMAP, POP3, and SMTP server settings.
- Click Connect β setup completes in approximately 30 seconds.
βοΈ 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.
- Open BlueMail β Account Settings β Security β Enable Two-Factor Authentication.
- Link your phone number or authenticator app for 2FA verification codes.
- Add email account β Choose OAuth2 or manual server configuration.
- Enter server details from the table above
- Complete login with 2FA code β 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.
- Open Apple Mail β Mail β Add Account β Other Mail Account.
- Enter your name, email address, and password β click Continue.
- Select IMAP account type β Incoming server.
- Next: Outgoing server
- Click Sign In β 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.
- Go to Settings β Mail β Accounts β Add Account β Other.
- Enter name, email, password β Next.
- Account Type: IMAP β Incoming:
[IMAP SERVER]Port993SSL. - Enter your outgoing SMTP server and port.
- Next β Save β 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.
- Go to: Settings β Accounts β Add Account β Email (or Gmail app).
- Enter email + password β Next.
- Account Type: IMAP
- Outgoing server details β Require authentication.
- Next β Sign In β 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.
- Click New Account β Mail
Authentication requires full email address + password for both incoming and outgoing servers.Click Next β Finish β 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.
- Mailbird β Add Account β Enter your email address to begin.
- Choose Manual Setup β OAuth2 authentication method from options.
- Browser opens your provider’s login page β enter credentials β Authorize Mailbird.
- Mailbird receives access token and automatically configures IMAP/SMTP servers.
- Setup completes β full email synchronization begins automatically.
Mailspring OAuth2 IMAP Configuration
Mailspring OAuth2 setup provides secure email access without storing passwords directly in the application.
- Add new email account β Select Custom IMAP configuration option.
- Incoming
IMAP SERVERand outgoingSMTP SERVER. - Mailspring prompts OAuth2 authorization via browser window for secure login.
- Log into your provider account and grant Mailspring access permissions.
- Mailspring automatically manages authentication tokens β seamless email access established.
Postbox Manual IMAP Synchronization
Postbox IMAP setup with manual synchronization control for precise email folder management and immediate updates.
- Add IMAP account β Enter IMAP Server details.
- Outgoing SMTP with full email authentication.
- Postbox connects and displays folder structure automatically.
- Right-click any folder β Get Messages for immediate manual synchronization.
- 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.
- Open SendBlaster β Settings β SMTP Configuration section.
- Enter SMTP Server and Port: do not forget to Enable TLS encryption.
- Authentication: Your full email address + password (required).
- Click Test Connection β verify green success indicator appears.
- Save settings β 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.
- Incoming Server and encryption required.
- Authentication: Full email address + password for secure connection.
- Enable real-time folder synchronization settings in MailJerry preferences.
- 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.
- Add new account β Select OAuth2 authorization method.
- Your provider opens login portal β enter credentials securely.
- Grant Clean.email permissions for email read/write access.
- OAuth2 token enables real-time message management, filtering, and organization.
- Setup complete β 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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Frequently Asked Questions
Do I need Juno Platinum for third-party mail client access?
Historically yes: Juno’s free tier was limited to the Juno client software, and third-party SMTP/IMAP/POP3 access required Juno Platinum or an equivalent paid tier. Current policy varies with grandfathered plans. If SMTP authentication fails despite correct credentials, the account tier may lack third-party relay authorization; contact Juno customer support to confirm.
How do I recover a Juno password?
Use the Juno webmail login page password recovery flow at my.juno.com. If the recovery contact information is outdated, contact Juno customer support directly with proof of account ownership. United Online handles Juno support jointly with NetZero.
Is Juno still accepting new signups?
Yes, Juno continues to accept signups through its paid tiers (Juno Turbo, Juno Platinum) primarily for dial-up backup access. The free ad-supported tier still exists but with limited functionality. For most users evaluating email in 2026, a mainstream provider (Gmail, Outlook.com, Fastmail) is a stronger choice.
Does Juno support OAuth2?
No. Juno supports only password-based SMTP authentication. OAuth2 is not implemented on the smtp.juno.com endpoints.
Which SMTP port works when 587 is blocked?
Switch to port 465 with implicit SSL/TLS. US corporate networks and some mobile carriers block outbound 587 but leave 465 accessible. Both ports use identical Juno credentials.
About This Guide
The Juno server settings on this page were last verified in July 2026 against Juno customer support documentation and community reports on active mailboxes. Because Juno is a legacy US ISP under United Online, verification relies on active connection testing supplementing the published documentation. SMTPedia re-verifies these settings quarterly. If you find a discrepancy between what is documented here and what Juno currently requires, please report it so we can update the reference.
About the Author
Alaa Β· LinkedIn
Email infrastructure specialist with 8+ years of hands-on experience in SMTP, deliverability, and email verification. Iβve configured and troubleshot mail systems across Postfix, Exchange, and cloud relays, managed IP reputation and warmup campaigns, and built verification pipelines processing millions of addresses. My work spans DNS authentication (SPF, DKIM, DMARC, BIMI), bounce handling, blocklist monitoring, and compliance frameworks including CAN-SPAM and GDPR. I write every article on SMTPedia to give email professionals, developers, and marketers the accurate, RFC-grounded reference they need.
About SMTPedia
SMTPedia is an independent email industry reference covering SMTP, IMAP, POP3, email deliverability, marketing platforms, DNS authentication, and email verification. Every article is researched from official provider documentation, IETF RFCs, and industry best practices. Settings and configurations are verified quarterly.
We are cited as a source by ChatGPT, Microsoft Copilot, and thousands of email professionals worldwide. Learn more about our editorial process.
