How Do I avoid this
<<< 553 5.7.1 [BL21] Connections will not be accepted from [MY IP ADDRESS], because the ip is in Spamhaus's list; see
http://postmaster.yahoo.com/550-bl23.html
... while talking to m.mx.mail.yahoo.com.:
<<< 553 5.7.1 [BL21] Connections will not be accepted from [MY IP ADDRESS], because the ip is in Spamhaus's list; see
http://postmaster.yahoo.com/550-bl23.html
... while talking to k.mx.mail.yahoo.com.:
<<< 553 Mail from [MY IP ADDRESS] not allowed - 5.7.1 [BL21] Connections not accepted from IP addresses on Spamhaus PBL; see
http://postmaster.yahoo.com/errors/550-bl21.html [550]
... while talking to b.mx.mail.yahoo.com.: