For IONOS Mail Basic and IONOS Mail Business

In this article, you can find information about the IONOS mail servers for setting up your email programs or apps.

Please Note

For an overview with links to step-by-step instructions for the most popular email programs and apps, please see the following article:

Setting Up Email Programs for an IONOS Email Address

Connection Data for IONOS Email Accounts

Account type IMAP POP3
Port 993995
Connection type/Encryption SSL/TLSSSL/TLS
Port 465
Connection type SSL/TLS
Please Note

For email transfer to work between your devices or programs and our email servers, they must support TLS 1.2 or higher. The following programs and operating systems support TLS 1.2:

  • Microsoft Outlook 2016 (only if all Windows and Office updates are installed)

  • Microsoft Outlook 2019 and newer

  • Mozilla Thunderbird 52.0 and later versions

  • Microsoft Windows 8 and newer

  • Apple macOS Sierra 10.12.6 and newer versions

  • Apple iOS 9 and newer

  • Android 5.0 and newer

IMAP, POP3, what is it?

IMAP and POP3 are methods of receiving email. When setting up your email program, you can choose between IMAP and POP3. We recommend IMAP as the account type for your inbox. Apply the settings from the IMAP column. Learn more about POP3 and IMAP here.

Using the Alternative SMTP Port 587

If your email program cannot connect to the outgoing mail server even though all the details are correct, it may be that access to port 465 is blocked on your network. If this is the case, IONOS offers the alternative port 587.

How to change your email program to port 587:

  • Start your email program.
  • Go to the outgoing mail server settings.
  • Change the port settings from 465 to 587.
  • Adjust the encryption method:

    Thunderbird: Change the encryption setting from SSL/TLS to STARTTLS.

    Outlook 2016/2019: Change the SMTP connection type to TLS.

    Outlook (Microsoft Office 365): Change the SMTP connection type to STARTTLS.

    Gmail App: Change the encryption setting from SSL/TLS to STARTTLS.

Please Note

For Outlook 2016/2019, you need to change the setting from SSL to TLS.

Additional Information