Existing @aon.at addresses run on A1's mail platform. Official A1 settings: securemail.a1.net for everything, IMAP 993 SSL, POP3 995 SSL, SMTP 587 STARTTLS, full email address as username. History of the AON brand, webmail access and fixes for old aon.at setups.

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Legacy brand notice

@aon.at mail now runs on A1’s mail servers

AON was the internet brand of Telekom Austria. After Telekom Austria and mobilkom austria merged into A1 Telekom Austria in 2010, the group’s product names were brought together under the single A1 brand in 2010 and 2011. Existing @aon.at addresses still work and use the same mail servers as @a1.net. Old setups that point to aon.at hostnames, port 110 or port 25 should be switched to the A1 settings below.

Aon.at email settings (A1 servers)

These are the encrypted settings published by A1 in its official server settings FAQ. A1 uses one host, securemail.a1.net, for incoming and outgoing mail.

Protocol	Server	Port	Encryption
IMAP (incoming, recommended)	securemail.a1.net	993	SSL/TLS
POP3 (incoming)	securemail.a1.net	995	SSL/TLS
SMTP (outgoing)	securemail.a1.net	587	STARTTLS

Username: your full @aon.at address. Password: your A1 email password. Outgoing server: turn on authentication with the same username and password. Webmail: a1.net/mail.

What happened to the AON brand

AON (often written aon or Aon) was the consumer internet and fixed-line brand of Telekom Austria, the incumbent Austrian operator. Its customers received @aon.at email addresses with their internet access.

In July 2010, Telekom Austria TA AG and mobilkom austria AG merged into A1 Telekom Austria AG. In 2010 and 2011 the fixed-line, mobile and internet product names were brought together under the A1 umbrella brand, and the AON name disappeared from new products. The @aon.at domain stayed in service for existing mailboxes, which today use the same A1 mail infrastructure as @a1.net addresses.

If you would rather migrate

Same provider

A1.net

If you are still an A1 customer, ask A1 whether an @a1.net address is available on your contract. It uses the same servers as your @aon.at mailbox.

Independent

Gmail or Outlook.com

Free international mailboxes that do not depend on your internet provider. Both can import mail from an IMAP account.

German-language

GMX or Web.de

German-language webmail services widely used in Austria, also independent of your internet provider.

Common issues

An old Outlook setup with port 110 or port 25 stopped working

Many @aon.at accounts were set up years ago with unencrypted settings (POP3 on port 110, SMTP on port 25 without authentication). Change the account to securemail.a1.net: POP3 on 995 with SSL or IMAP on 993 with SSL, and SMTP on 587 with STARTTLS. In Outlook, also tick “My outgoing server (SMTP) requires authentication” and use the same settings as the incoming server.

Sending fails while receiving works

Check three things: the outgoing port is 587, the encryption is STARTTLS (not SSL/TLS), and SMTP authentication is turned on with your full @aon.at address and password.

Test your password in webmail at a1.net/mail first. If webmail accepts it, the problem is in the client settings; if not, reset the email password through your A1 account or A1 customer service.

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 → Security → App passwords (2-Step Verification must be enabled).
Generate App Password for “Mail” → copy 16-character password.
Gmail → Settings → See all settings → Forwarding and POP/IMAP.
Enable IMAP → 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.

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

WordPress SMTP Plugin Configuration (WP Mail SMTP + MailPoet)

mailpoet smtp setup integration — WP Email SMTP

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 → Settings or MailPoet → Settings → Sending tab.
Select “Other SMTP” as your mailer method from the dropdown.
Enter SMTP settings with Port 587 and 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.

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

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 → Account Settings → Account Actions → Add Mail Account.
Enter your email address and click Continue to begin setup.
Select IMAP protocol and choose OAuth2 authentication method if your provider supports it (Gmail, Microsoft and Yahoo do; many smaller providers do not, in which case choose Normal password).
Thunderbird opens a browser window → log in to your provider → Grant access permissions.
Automatic configuration applies: Incoming: use the IMAP server address from the settings table above, port 993, SSL
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):

Go to File → Add Account → Enter your email address + password.
Outlook automatically detects IMAP, POP3, and SMTP server settings.
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.

Open BlueMail → Account Settings → Security → Enable Two-Factor Authentication.
Link your phone number or authenticator app for 2FA verification codes.
Add email account → Choose OAuth2 or manual server configuration.
Enter server details from the table above
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.

Open Apple Mail → Mail → Add Account → Other Mail Account.
Enter your name, email address, and password → click Continue.
Select IMAP account type → Incoming server.
Next: Outgoing server
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.

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

New mail checks: for standard IMAP accounts, iOS Mail checks for new mail on the schedule set under Fetch New Data in the Mail account settings; instant push is only offered for some account types, such as iCloud and Exchange.

Android Mail App Configuration

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

Go to: Settings → Accounts → Add Account → Email (or Gmail app).
Enter email + password → Next.
Account Type: IMAP
Outgoing server details → Require authentication.
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.

Click New Account → Mail
Authentication requires full email address + password for both incoming and outgoing servers.
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.

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

Add new email account → Select Custom IMAP configuration option.
Incoming IMAP SERVER and outgoing SMTP 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 → 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 → Enter IMAP Server details.
Outgoing SMTP with full email authentication.
Postbox connects and displays folder structure automatically.
Right-click any folder → 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 → Settings → 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 → verify green success indicator appears.
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.

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 → Select OAuth2 authorization method.
Your provider opens login portal → enter credentials securely.
Grant Clean.email permissions for email read/write access.
OAuth2 token enables real-time message management, filtering, and organization.
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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FAQ

Is @aon.at still working in 2026?

Yes. Existing @aon.at addresses are served by A1’s mail platform and send and receive mail normally, with the same server settings as @a1.net.

What are the correct current server settings?

A1 lists one host for everything: securemail.a1.net. IMAP port 993 SSL, POP3 port 995 SSL, SMTP port 587 STARTTLS. The username is your full @aon.at address.

Are securepop.a1.net and securesmtp.a1.net correct?

No. A1’s official settings use securemail.a1.net for POP3, IMAP and SMTP alike. Use that single host in every server field.

Can I use port 465 for sending?

A1’s official settings list port 587 with STARTTLS for outgoing mail. Use 587.

Where is the webmail for aon.at?

At a1.net/mail, the same webmail used for @a1.net addresses.

Where to go next

About This Guide

The server settings on this page were verified in November 2026 against A1’s official FAQ “A1 E-Mail Servereinstellungen”. SMTPedia re-verifies these settings regularly; if you find a discrepancy, please report it so we can update the reference.

Sending mass emails from your @aon.at address? Personal mailboxes are not designed for newsletters or transactional flows. SMTPing gives you a dedicated relay with proper SPF, DKIM, and DMARC alignment for reliable delivery at scale.

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About the Author

Alaa · LinkedIn

Email infrastructure specialist with 8+ years of hands-on experience in SMTP, deliverability, and email verification. I’ve 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.

AON.at Email Settings 2026 (a1.net): SMTP, POP and IMAP