Syncing your contacts with your iOS device's address book
The cardDav protocol allows you to sync your mail.com contacts with
the contacts app on your iPhone, i.e. any changes made on your iPhone will be available on
mail.com and vice versa.
Enter the server address caldav.mail.com in the
Server field.
Enter your mail.com email address in the Username field
and the application-specific password you created in step 1 in the Password field.
Tap on Next.
Tap on Save.
Your mail.com calendar will now sync with your iPhone calendar.
Info:
If you retrieve your emails via POP3/IMAP, you will then need a separate
application-specific password. Use this instead of your usual password in the email
programme or the email app provided by the other provider.