How to say this is the second mail we send you referring to the invoice no.1111 which has not been settled. in Japanese
1)
このこの(kono) (n) thisメールメール(meru) (n,vs) email/mail/maleはは(ha) (int) indicating a subject/yes/indeed/well/ha!/what?/huh?/sigh、、(、) Japanese comma未払い未払い(miharai) (adj-no,n) unpaid/overdueにに(ni) (prt) indicates such things as location of person or thing, location of short-term action, etc.なな(na) (prt) connects adj to noun/indicates emotion or emphasis/command/prohibitionっているno dictionary result, likely a conjigated verbno dictionary result, likely a conjigated verb請求書請求書(seikyuusho) (n) bill/job invoice１１１１no dictionary result, likely a conjigated verbno dictionary result, likely a conjigated verbにに(ni) (prt) indicates such things as location of person or thing, location of short-term action, etc.関すno dictionary result, likely a conjigated verbno dictionary result, likely a conjigated verbるる(ru) (n) exile２２(２) (num) two回目回目(kaime) (n) -nth time aroundのの(no) (prt) indicates possessive/nominalizes verbs and adjectives/substitutes for "ga" in subordinate phrases/indicates a confident conclusion/ indicates emotional emphasis/indicates questionメールメール(meru) (n,vs) email/mail/maleですです(desu) (aux) be/is/are。。(。) Japanese period "."
