Note: These GMX email settings cover all active GMX domains including gmx.de, gmx.net, gmx.at, gmx.fr, gmx.com, gmx.ch, gmx.co.uk, gmx.li. No major GMX domains are currently discontinued, though gmx.us is sometimes flagged as high-risk/disposable.
GMX Email Settings (SMTP, POP3 and IMAP)
Like other free email providers, this configuration includes gmx.de, gmx.com, gmx.at and gmx.fr. You can also check t-online.de smtp settings.
GMX IMAP Settings
| gmx.com (GMX Freemail) IMAP Server | imap.gmx.de or imap.gmx.com or imap.gmx.at or imap.gmx.at |
| IMAP port | 993 |
| IMAP security | SSL / TLS |
| IMAP username | Your full email address |
| IMAP password | Your GMX password |
GMX POP3 Settings
| gmx.com (GMX Freemail) IMAP Server | pop.gmx.de or pop.gmx.com or pop.gmx.at or pop.gmx.at |
| IMAP port | 995 (or 110) |
| IMAP security | SSL / TLS for port 995 (without for port 110) |
| IMAP username | Your full email address |
| IMAP password | Your GMX password |
GMX SMTP Settings
| gmx.com (GMX Freemail) SMTP Server | mail.gmx.com |
| SMTP port | 587 |
| SMTP security | STARTTLS |
| SMTP username | Your GMX email address |
| SMTP password | Your GMX password |
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 โ Security โ App passwords (2-Step Verification must be enabled).
- Generate App Password for “Mail” โ copy 16-character password.
- Gmail โ Settings โ See all settings โ Forwarding and POP/IMAP.
- Enable IMAP โ 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.
โ 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 โ Settings or MailPoet โ Settings โ Sending tab.
- Select “Other SMTP” as your mailer method from the dropdown.
- Enter SMTP settings and port number.
- Input your full email address and password in the authentication fields.
- Click Save Settings and send a test email to verify the configuration works.
โ 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 โ Account Settings โ Account Actions โ 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 โ log in to your provider โ Grant access permissions.
- Automatic configuration applies
- Click Done โ 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):
- Go to File โ Add Account โ Enter your email address + password.
- Outlook automatically detects IMAP, POP3, and SMTP server settings.
- Click Connect โ setup completes in approximately 30 seconds.
Manual Setup (For Advanced Users):
- Incoming Server: Imap or Pop3
- Outgoing SMTP Server
- 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 โ Account Settings โ Security โ Enable Two-Factor Authentication.
- Link your phone number or authenticator app for 2FA verification codes.
- Add email account โ Choose OAuth2 or manual server configuration.
- Enter server details
- Complete login with 2FA code โ 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 โ Mail โ Add Account โ Other Mail Account.
- Enter your name, email address, and password โ click Continue.
- Select IMAP account type โ Incoming server
- Next, outgoing SMTP server
- Click Sign In โ 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.
- Settings โ Mail โ Accounts โ Add Account โ Other.
- Enter name, email, password โ Next.
- Account Type: IMAP โ Incoming
- Account Type: SMTP
- Next โ Save โ 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.
- Settings โ Accounts โ Add Account โ Email (or Gmail app).
- Enter email + password โ Next.
- Account Type: IMAP.
- Outgoing:
SMTPโ Require authentication. - Next โ Sign In โ 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 eM Client with precise IMAP/POP3 server settings for reliable email synchronization and full folder support.
- Click New Account โ Manual Setup โ Select IMAP or POP3 protocol.
- Incoming Server:
YOUR IMAP SERVER DETAILS. - Outgoing Server:
YOUR SMTP SERVER DETAILS. Authentication requires full email address + password for both incoming and outgoing servers.Click Next โ Finish โ 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 โ Add Account โ Enter your email address to begin.
- Choose Manual Setup โ OAuth2 authentication method from options.
- Browser opens your provider’s login page โ enter credentials โ Authorize Mailbird.
- Mailbird receives access token and automatically configures IMAP/SMTP servers.
- Setup completes โ 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 โ Select Custom IMAP configuration option.
- Incoming:
YOUR IMAP SERVER DETAILS. - Outgoing:
YOUR SMTP SERVER DETAILS. - 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 โ 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 โ Server:
[IMAP SERVER]:993 SSL. - Outgoing SMTP:
YOUR SMTP SERVER DETAILS. - Postbox connects and displays folder structure automatically.
- Right-click any folder โ Get Messages for immediate manual synchronization.
- Manual sync updates local mailbox instantly with server changes (read status, deletions, organization).
๐จ SendBlaster SMTP Configuration (Bulk Email)
Bulk email SMTP configuration in SendBlaster requires precise server authentication for reliable campaign delivery.
- Open SendBlaster โ Settings โ SMTP Configuration section.
- Enter SMTP Server:
YOUR SMTP SERVER DETAILSand Port number. - Authentication: Your full email address + password (required).
- Click Test Connection โ verify green success indicator appears.
- Save settings โ 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:
YOUR IMAP SERVER DETAILS. - 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.
- Complete setup ensures consistent mailbox status everywhere you check email.
Clean.email OAuth2 Synchronization Setup
Clean.email OAuth2 setup provides secure mailbox access without sharing passwords directly with the application.
- Add new account โ Select OAuth2 authorization method.
- Your provider opens login portal โ enter credentials securely.
- Grant Clean.email permissions for email read/write access.
- OAuth2 token enables real-time message management, filtering, and organization.
- Setup complete โ Clean.email maintains secure, ongoing mailbox synchronization.
๐ Best Email Client 2026 Comparison (eM Client vs Outlook vs Gmail)
| Client | IMAP Sync | OAuth2 | Mobile App | Bulk Send | Overall Score |
|---|---|---|---|---|---|
| eM Client | โ | โ | โ | โ | โญโญโญโญโญ |
| Outlook | โ | โ | โ | โ | โญโญโญโญ |
| Gmail | โ | โ | โ | โ | โญโญโญโญ |
| Thunderbird | โ | โ | โ | โ | โญโญโญ |
| Mailbird | โ | โ | โ | โ | โญโญโญโญ |
| Apple Mail | โ | โ | โ | โ | โญโญโญ |
| iOS Mail | โ | โ | โ | โ | โญโญโญ |
| Android Mail | โ | โ | โ | โ | โญโญโญ |
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
465 SSLas 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.
About GMX and its email service
GMX is a free webmail provider owned by 1&1 Mail & Media (part of United Internet), operating gmx.com, gmx.de, gmx.net, and country-specific variants across Europe. Founded in Germany in 1997, GMX predates many popular webmail services and remains one of the most-used free mailbox providers in the German-speaking market. The service offers unlimited storage, full IMAP/POP3/SMTP access, and integrates with Mail Collector for consolidating multiple external accounts into a single GMX inbox.
Setting up GMX in a mail client
Before external mail-client access will work, IMAP/POP3 access must be explicitly enabled in the GMX webmail settings (this is disabled by default for security reasons in newer accounts). Once enabled, configure IMAP on imap.gmx.com or imap.gmx.net on port 993 with SSL/TLS, and SMTP on mail.gmx.com or mail.gmx.net on port 587 with STARTTLS. Authentication uses the full GMX email address as the username and the mailbox password. GMX also supports OAuth2 for OAuth-capable mail clients, which is preferable to password-based authentication for accounts with 2FA enabled.
Troubleshooting common GMX issues
The most common GMX support case is IMAP/POP3 access being disabled in webmail settings; users often forget to enable it and see cryptic authentication errors from their mail client. Second most common is rate limiting on outbound SMTP: GMX limits free accounts to a modest number of recipients per day (typically around 50-100), and exceeding the limit produces temporary sending blocks. For heavy senders, GMX offers a paid plan (GMX ProMail) with higher quotas. Connection issues on port 587 sometimes indicate an ISP blocking outbound SMTP; port 465 with implicit SSL/TLS is available as an alternative.
Deliverability at GMX in 2026
For senders reaching GMX recipients from outside, the platform applies standard authentication checks (SPF, DKIM, DMARC) plus German-market-specific content and behavioral filtering. GMX participates in feedback loops for major ESPs, and complaint rates should stay well below 0.1 percent to maintain sending reputation. Because GMX shares infrastructure with WEB.DE (both owned by 1&1), the same deliverability practices apply to both platforms; a sender with problems at GMX typically sees similar problems at WEB.DE. RFC 8058 one-click unsubscribe headers are strongly recommended for bulk sending to the platform.
Alternatives in the German-speaking market
GMX competes with WEB.DE (same corporate owner), T-Online, Freenet Mail, and Posteo in the German-speaking free mail market, plus international providers like Gmail and Outlook.com. Posteo and Mailbox.org are the preferred alternatives for users who prioritize privacy and are willing to pay a small monthly fee; both are GDPR-first providers based in Germany. Users migrating from GMX typically use Thunderbird IMAP copy or a dedicated migration tool to transfer messages to the new provider. Because GMX offers unlimited storage, migration is rarely forced by capacity constraints; users move for privacy, features, or workplace integration.
About GMX
gmx.degmx.com · gmx.net · gmx.at · gmx.ch · gmx.frGMX (Global Message eXchange) launched in 1997 as one of Germany's first free webmail services. Acquired by United Internet AG in 2000, GMX became a flagship consumer brand alongside its sister service Web.de. Both services share the same backend infrastructure and are operated as separate consumer brands targeting different demographics.
GMX serves an estimated 30+ million active users primarily in German-speaking countries (Germany, Austria, Switzerland), with additional presence in France (gmx.fr) and English-speaking markets (gmx.com). The service offers free 1 GB email storage plus 2 GB file storage, with paid ProMail plans available.
Technically, GMX supports IMAP, POP3, and SMTP with SSL/TLS on standard secure ports. Login uses the full email address; the service enforces strong password policies and offers two-factor authentication.
Timeline
- 1997GMX launched by GMX AG
- 2000Acquired by United Internet AG
- 2000sExpansion to gmx.com, gmx.at, gmx.ch, gmx.fr
- 2010sIntegration with Web.de infrastructure
GMX and Web.de together represent the largest German-owned consumer email operation, competing directly with Deutsche Telekom's T-Online. United Internet AG (parent of both) also owns 1&1 IONOS (hosting) and Ionos SE, making it one of the largest European internet services conglomerates.
About the Author
Alaa ยท LinkedIn
Email infrastructure specialist with 8+ years of hands-on experience in SMTP, deliverability, and email verification. Iโve 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.
