Posteo is a German paid email provider (Posteo e.K., Berlin) with a single flat plan at 1 EUR/month, no free tier, no upsell tiers, and no custom domain support. Every account gets 2 GB of mail storage, standard IMAP, POP3, and SMTP protocols, an optional additional 1-4 GB in 1 EUR/month increments, and a choice of Posteo-owned domains (@posteo.de, @posteo.net, @posteo.eu, @posteo.com, @posteo.org). Signup is anonymous: no name, no phone number, no personal data required. Payment can be made anonymously by cash sent by post. This guide covers the server settings and the deliberate minimalism that makes Posteo one of the simplest paid privacy mail options in 2026.
Setup context
Standard protocolsAnonymous signup
Posteo works with any standard mail client via IMAP, POP3, and SMTP. No custom domain option, no plan tiers to compare, no app password gate: the account password authenticates directly against the mail servers. The one nuance is that Posteo uses a single hostname (posteo.de) for all three protocols; only the port changes.
Quick reference: Posteo server settings
All three protocols use the single hostname posteo.de, SSL/TLS encryption, and full-address authentication. Full email address as username; account password (or 2FA app password if enabled) as authentication.
| Protocol | Server | Port | Encryption | Auth |
|---|---|---|---|---|
| SMTP | posteo.de | 465 or 587 | SSL/TLS or STARTTLS | Full address + password |
| IMAP | posteo.de | 993 | SSL/TLS | Full address + password |
| POP3 | posteo.de | 995 | SSL/TLS | Full address + password |
Posteo SMTP settings
Posteo SMTP uses posteo.de on port 465 with implicit SSL/TLS or port 587 with STARTTLS. Authenticate with the full email address and account password. Posteo enforces a mandatory encrypted connection: unencrypted SMTP on port 25 is not accepted from clients.
Send limits are modest and set for personal use: roughly 100 outgoing messages per day per account. This is by design, since Posteo positions itself as a personal correspondence tool, not a bulk sender. For any volume above personal correspondence, use a dedicated relay like Mailgun, Postmark, or Amazon SES and keep Posteo for private mail.
Posteo IMAP settings
Posteo IMAP uses posteo.de on port 993 with SSL/TLS. Same full-address username; same account password. Posteo supports IMAP folder hierarchy, server-side search, and message flags. Because Posteo does not offer custom domains, all addresses are @posteo.de/@posteo.net/@posteo.eu/@posteo.com/@posteo.org variants and share the same server infrastructure.
Base storage is 2 GB, expandable in 1 EUR/month increments (1 EUR adds 1 GB, up to 6 GB total). Posteo does not track user by IP: mail server logs are rotated frequently and no personal data is stored beyond the account itself. Storage is the only paid upsell.
Posteo POP3 settings
Posteo POP3 uses posteo.de on port 995 with SSL/TLS. POP3 downloads messages to a single device and (by default) removes them from the server after retrieval. Enable “leave copy on server” in the mail client for multi-device use, or use IMAP.
POP3 works reliably with Posteo and is a legitimate choice for single-device archival use cases. There is no unencrypted or STARTTLS variant for POP3: 995 with implicit SSL is the only accepted configuration.
Anonymous signup and payment
Posteo does not require a name, phone number, address, or any personal identifier at signup. Payment can be made by credit card, SEPA direct debit, PayPal, or (most anonymously) cash sent by post in an envelope to Posteo’s Berlin address. Cash payments are recorded manually and are not linked to the mail account beyond the amount and the account number. This makes Posteo one of the few paid providers where the operator has no way to correlate the account with a real identity.
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
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No. Posteo is 1 EUR/month, paid-only, from the first day. There is no free trial and no free tier. The 1 EUR flat rate has been unchanged since Posteo’s launch in 2009.
Can I use a custom domain with Posteo?
No. Posteo deliberately does not support custom domains: the operational simplicity and the anonymous-payment model both depend on Posteo being the only party in the mail path. If custom domain support is required, Mailbox.org is the closest German alternative at similar pricing.
Does Posteo require a name or phone number to sign up?
No. Posteo asks only for the desired email address and password. Payment can be made anonymously by cash sent by post to Posteo’s Berlin address, at which point Posteo has no way to correlate the account with a real identity. This is a genuine differentiator among paid providers.
Do I need an app password for Posteo?
Only if two-factor authentication is enabled. 2FA is optional at Posteo; when it is on, generate an app-specific password in Settings then Security. When 2FA is off, the account password works directly against IMAP, POP3, and SMTP.
How does Posteo compare to Mailbox.org?
Both are German privacy providers at 1 EUR/month. Posteo is a single flat plan, anonymous signup and payment, no custom domains, no cloud storage. Mailbox.org offers plan tiers with custom domain support, over 100 alias domains, and integrated cloud storage. Posteo is simpler and more anonymous; Mailbox.org is fuller-featured for professional use.
What domains does Posteo offer?
@posteo.de, @posteo.net, @posteo.eu, @posteo.com, and @posteo.org. All resolve to the same infrastructure. Users can add up to two alias addresses to the primary mailbox (both must be under Posteo’s domains). No custom domains.
Where is Posteo webmail?
Webmail is at posteo.de. The interface is Roundcube customized by Posteo. Log in with the full email address and account password (plus 2FA code if enabled). The webmail interface is minimal and consciously simple, matching Posteo’s minimalist product philosophy.
About this guide
These Posteo server settings were verified against Posteo’s official documentation at posteo.de/en/site/faq in July 2026. The single hostname and flat 1 EUR/month pricing have been stable since 2009. SMTPedia re-verifies each provider quarterly.
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.
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