Learn Polish: Zwykle dostajemy tu dużo maili. - We usually get a lot of emails here.

The adverb zwykle (usually) tells us this is a repeated, habitual action, which requires the imperfective aspect. The perfective verb for 'to get' is dostać, and we form its imperfective counterpart by adding the suffix -awać, creating dostawać.

The infinitive is dostawać. Where does the j in dostajemy come from?

Verbs that form their imperfective aspect with the suffix -awać have a special conjugation pattern. In the present tense, you drop the -wa- from the stem and replace it with a -j- before adding the standard endings. Because of this rule, we say dostajemy rather than the incorrect form dostawamy. You will see this exact same pattern with the base verb dawać (to give), which becomes dajemy (we give).

Why is the word for emails maili and not just maile?

The word dużo (a lot) is a quantifier, and it requires the noun that follows it to take the genitive case. Since we are saying 'a lot of emails', we need the genitive plural form. Mail is an English loanword, and its genitive plural takes the -i ending, resulting in maili.

Could I change the word order and say Dostajemy tu dużo maili zwykle?