Advait,
hi yes i can ping my router as well as DNS through other machines. this situation happened suddenly today afternoon. when mail server was working properly. is there any network service that i should start. or should i try it by stoping firewall. or is the problem of ip conflict.
Try restarting the IMAP daemon I guess SuSE Linux comes with UWIMap by default.
Check for this file /etc/xinetd.d/imap should read like : service imap { disable = no socket_type = stream protocol = tcp wait = no user = root server = /usr/sbin/imapd flags = IPv4 }
Restart xinetd with following command. rcxinetd restart; It should work mostly if nothing else would have been broken.
Look over here, thats knowledgebase for SuSE product range. http://support.novell.com/search/kb_index.jsp
Thanks & Regards, Mitul Limbani, Founder & CEO, Enterux Solutions, The Enterprise Linux Company (TM), www.enterux.com