Webmail is an email service provider that is also known as IONOS email. Here are the steps to log into 1 and 1 webmail:
1. Visit the official site of the email service.
2. Open the 1&1 Webmail login page.
3. Look at the right side of the menu panel, and then click on the “Sign In” link.
4. Then, type your email address or customer ID and password in the given fields.
5. Click on the “Sign in” button.
Source: https://getassist.net/ionos-1and1-email-login/