Dear Friends ,

I have postfix mail server it is in running condition. But suddenly it is giving me error *Unknown user or password incorrect. * when I check log it is showing me *"Sep 5 10:26:51 student dovecot: imap-login: Aborted login (auth failed, 1 attempts): user=jiten@student.ac.in, method=PLAIN, rip=192.168.1.2, lip=192.168.1.2, secured"*

After wait for few second it is giving me another log .

Sep 5 10:08:45 student postfix/anvil[9307]: statistics: max connection rate 1/60s for (smtp:10.200.12.1) at Sep 5 10:05:25 Sep 5 10:08:45 student postfix/anvil[9307]: statistics: max connection count 1 for (smtp:10.200.12.1) at Sep 5 10:05:25 Sep 5 10:08:45 student postfix/anvil[9307]: statistics: max cache size 1 at Sep 5 10:05:25 Sep 5 10:13:56 student postfix/smtpd[9447]: connect from mailrly1.student.ac.in[192.168.1.2] Sep 5 10:13:56 student postfix/smtpd[9447]: warning: restriction check_sender_mx_access: bad argument "/etc/postfix/maps/verisign_mx_access": need maptype:mapname Sep 5 10:13:56 student postfix/smtpd[9447]: NOQUEUE: reject: RCPT from mailrly1.student.ac.in[192.168.1.2]: 451 4.3.5 Server configuration error; from=webmaster@strandbookstall.com to=divya@student.ac.in proto=SMTP helo=<mailrly1.student.ac.in> Sep 5 10:13:56 student postfix/cleanup[9451]: 20E2BFA0F54: message-id=< 20120905044356.20E2BFA0F54@student.student.ac.in> Sep 5 10:13:56 student postfix/smtpd[9447]: disconnect from mailrly1.student.ac.in[192.168.1.2] Sep 5 10:13:56 student postfix/qmgr[9236]: 20E2BFA0F54: from=< double-bounce@student.student.ac.in>, size=791, nrcpt=1 (queue active) Sep 5 10:13:56 student postfix/virtual[9452]: 20E2BFA0F54: to=< postmaster@student.ac.in>, orig_to=<postmaster>, relay=virtual, delay=0.12, delays=0.06/0/0/0.05, dsn=5.1.1, status=bounced (unknown user: " postmaster@student.ac.in") Sep 5 10:13:56 student postfix/bounce[9453]: warning: 20E2BFA0F54: undeliverable postmaster notification discarded Sep 5 10:13:56 student postfix/qmgr[9236]: 20E2BFA0F54: removed Sep 5 10:17:16 student postfix/anvil[9449]: statistics: max connection rate 1/60s for (smtp:192.168.1.2) at Sep 5 10:13:56 Sep 5 10:17:16 student postfix/anvil[9449]: statistics: max connection count 1 for (smtp:192.168.1.2) at Sep 5 10:13:56 Sep 5 10:17:16 student postfix/anvil[9449]: statistics: max cache size 1 at Sep 5 10:13:56

I am not understand why It is giving me error and how to solve it. Even I search on google also but not find any answer there. So Please help me to solve the problem. ASAP