details are required to suggest something.
Qmail not started
1) Did you see any qmail proccess?
# ps ax|grep qmail
2) Have your tried to start it from cmd:
# /etc/init.d/qmail start
3) Can you connect to smtp port on localhost? on server IP?
# telnet localhost smtp
# telnet IP.IP.IP.IP smtp
Cannot login to webmail:
1) Which errors do you receive while logging?
2) Can you connect with another mail client?
3) Can you connect to imap from the server like:
# telnet localhost imap
Trying 127.0.0.1...
Connected to localhost.localdomain (127.0.0.1).
Escape character is '^]'.
* OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL ACL2=UNION STARTTLS] Courier-IMAP ready. Copyright 1998-2004 Double Precision, Inc. See COPYING for distribution information.
01 login
[email protected] password
01 OK Login
and finally:
Have you checked solutions in swsoft knowledge base?:
kb.swsoft.com