You can create application-specific passwords for using external email programs via
POP3/IMAP or integrating your mail.com calendar/address book (using CalDav
or CardDav) in an external program.
Info:
To use application-specific passwords, two-factor authentication must be activated.
Click on Home and on Security Options.
Click on Manage application-specific passwords.
Click on Create new application-specific password.
Enter your password and click on Continue.
Info:
The application-specfic password will be shown only once. Please write
down the password immediately.
Use the application-specfic password only for your external email program. Your
original password will no longer be required until you deactivate two-factor
authentication again.