Hello: In one of my servers I have installed Qmail, Vpop, RoundCube, and Courier Imap. All working perfect!, but now I need to use email clients like Outlook, Eudora, etc., and yesterday I patch Qmail with smtp-auth and make some modifications, but Vpop users can't recognize: [root@ks24740 html]# telnet localhost 25 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 220 webmail.onuba.com ESMTP ehlo 250-webmail.onuba.com 250-AUTH LOGIN CRAM-MD5 PLAIN 250-AUTH=LOGIN CRAM-MD5 PLAIN 250-PIPELINING 250 8BITMIME auth login 334 VXNlcm5hbWU6 cHJ1ZWJhQHJlY3JlLnR2Cg== 334 UGFzc3dvcmQ6 cHJ1ZWJhCg== 535 authorization failed (#5.7.0) My /var/qmail/supervise/qmail-smtpd/run is: exec /usr/local/bin/tcpserver -p -R -x /home/vpopmail/etc/tcp.smtp.cdb -u92 -g91 -v -c100 0 smtp /usr/local/bin/rblsmtpd -r bl.spamcop.net /var/qmail/bin/qmail-smtpd /bin/cmd5checkpw /usr/bin/true 2>&1 Please, any help?. Thanks!!