Was heisst mails eincheken

A German question!

"Einen Check einhecken" is a German phrase that literally means "to incorporate a check into something". In the context of email, it's not a common phrase, but I think you might be asking about "E-Mails einchecken", which means "to check emails" or "to log in to email".

In German, "einen Check einhecken" is more commonly used in the context of accounting or finance, where a check is a payment instrument. For example, a company might "einen Check einhecken" into their accounting system to record a payment.

If you meant to ask about checking emails, the correct phrase in German is "E-Mails einchecken" or simply "E-Mails lesen" (to read emails).