Problems with a few email addresses

If anyone knows who these people are I am deleting them due to eproblems...and I don't have the time to figure out the problems... eudora@raiford.org (reason: 550 5.5.0 The message contains mismatched CR or LF) These two are obvious though: anfps@attbi.com (reason: 551 not our customer) yeonk@pacific.net.sg (reason: 550 Invalid recipient: <yeonk@pacific.net.sg>) John :-#)# How to subscribe or unsubscribe from TTL To do either you send email to "MajorDomo@flippers.com" and in the body you state either "Subscribe techtoolslist" or "Unsubscribe techtoolslist", note that the Subject is "" (Blank)... FTP site is: ftp://ftp.flippers.com/pub/TTL/