Are you using an old app version?
Older versions of the mail.com Mail App are not longer supported by mail.com for security reasons. It is recommended that you update your mobile device in order to be able to use all mail.com apps in the future.
Are you locked out of your account?
There are different conditions that cause your account to be locked by the system. Some of these do not show an error message
in the mobile view.
Solution: find out why you are locked
Log into mail.com in your web browser and read the messsage you get after you have logged in successully. Follow the instructions shown there.
Is there a technical issue caused by mail.com?
It could be that a technical problem at mail.com has prevented you from signing in.
Solution: Have a look at the server status message at the top of the page.
All mail.com help pages have a server information message in the upper section. Please read this message. or contact us if no issue is shown but you can still not log in.