@v2win: in maintenance command, i enter: IPN DNS NSLOOKUP SMTP.YAHOO.COM.
and see: 
Name:     smarthost.YAHOO.COM
Address:  69.147.107.20  69.147.107.21  216.145.54.171  216.145.54.172  216.145.54.173  
Aliases:  SMTP.YAHOO.COM   
But when i enter that ip address in "email server" field, i have three errors:
"1.
Log Type   Software 
Log Number   4791 
Severity   Warning 
Date   2010/Nov/17 
Time   09:18:08 
Source   org.apache.tomcat.util.net.PoolTcpEndpoint 
Description   Reinitializing ServerSocket 
Module   Main 
File Name and Line Number   Unknown;4294967295 
2.
Log Type   Software 
Log Number   4790 
Severity   Error 
Date   2010/Nov/17 
Time   09:18:08 
Source   org.apache.tomcat.util.net.PoolTcpEndpoint 
Description   Endpoint null ignored exception: java.net.SocketException: SSL accept errorjava.io.IOException: Error in accept [53] <java.net.SocketException: SSL accept errorjava.io.IOException: Error in accept [53]>java.net.SocketException: SSL accept errorjava.io.IOException: Error in accept [53] at com.mitel.esmgmt.core.tomcat55.ssl.JavaLayerServe
 rSocketFactory.acceptSocket(Ljava/net/ServerSocket;)Ljava/net/Socket; [compiled] at org.apache.tomcat.util.net.PoolTcpEndpoint.accept
 Socket()Ljava/net/Socket; [compiled] at org.apache.tomcat.util.net.LeaderFollowerWorkerTh
 read.runIt([Ljava/lang/Object;)V [compiled] at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run()V [compiled] at java.lang.Thread.run()V [compiled]  
Module   Main 
File Name and Line Number   Unknown;4294967295 
3.
Log Type   Software 
Log Number   4789 
Severity   Error 
Date   2010/Nov/17 
Time   09:18:08 
Source   JavaLayer 
Description   Error in accept [53] 
Module   Main 
File Name and Line Number   MiSSL4jSocketImpl.cpp;96 ".
Help me 

 thanks