De or het mailade?

The correct Dutch article is:

de mailade

Rule Words ending in -ade: always de. See the rule

This word is not in the word lists we use to double-check answers.

How to use mailade

the mailadede mailade
this mailadedeze mailade
that mailadedie mailade
our mailadeonze mailade
your mailadejouw mailade
every mailadeelke mailade
which mailade?welke mailade?
a big mailade / the big mailadeeen grote mailade, de grote mailade