Help With Log Files

Could someone help me with this log file entry???

Apr 18 11:57:21 uranus postfix/qmgr[30567]: 5204C2BCB5E: from=<user@domainname>, size=3422, nrcpt=1 (queue active)
Apr 18 11:57:21 uranus postfix/smtpd[30577]: disconnect from unknown[SERVER_IP]
Apr 18 11:57:21 uranus sendmail[30590]: l3I6RL38030590: from=web1_user, size=129, class=0, nrcpts=1, msgid=<[email protected]>, relay=web1_user@localhost

The text in SERVER_IP is the IP of a server which filters mail and then sends mail to my ISP config server THe disconnect message is normal or does it indicate a error????
Question might sound basic

Plz help

 

Mail log

Thanx for the prompt & precise reply

Cool to get help quickly on the forums

From,
Syd