[PERDITION-USERS] how to check user from text file in popmap.re???

Dear all, hi..i want to setup perdition server before 2 sendmail with openwebmail servers. But there are 200 users divided into 2 different sendmail servers A & B.. ...so..i made 2 text files /etc/sendmailA.txt and /etc/sendmailB.txt which are marked down which users are mapped to certain servers... but...in your "popmap.re" example, there are only divided character starting from A to F will map to server A and others will map to server B...but..I can't divide the user in this way...I must map those user from /etc/sendmailA.txt & /etc/sendmailB.txt ...then how to check user login name from both "/etc/sendmailA.txt & sendmailB.txt" in popmap.re .... thx for your attention and patience... regards, winnie