Our postfix in ubuntu server sends emails to our own abc.com domain. We do not use any symantec messagelab service at all. the DNS used is google 8.8.8.8
For the past few days, we have some bounceback from messagelab saying we try to use their server to relay.
I wonder how this could happen. Any help is appreciated. I could give actual domain if private message is allowed to symantec staff.
Feb 20 14:19:26 XXXXX postfix/smtp[9690]: 7B87F20172: to=<steve@abc.com>,
relay=cluster3.eu.messagelabs.com[85.158.142.99]:25, conn_use=2, delay=215, delays=0/212/1.3/1.2, dsn=5.0.0, status=bounced (host cluster3.eu.messagelabs.com[85.158.142.99] said: 553-you are trying to use me [server-18.tower-224.messagelab 553-s.com] as a relay, but I have not been configured to 553-let you [YYY.YYY.YYY.YYY, XXXXX.com] do this. 553-Please visit www.symanteccloud.com/troubleshooting for 553-more details about this error message and instructions 553 to resolve this issue. (#5.7.1) (in reply to RCPT TO command))Feb 20 14:19:26 XXXXX postfix/smtp[9690]: 7B87F20172: to=<steve@abc.com>, relay=cluster3.eu.messagelabs.com[85.158.142.99]:25, conn_use=2, delay=215, delays=0/212/1.3/1.2, dsn=5.0.0, status=bounced (host cluster3.eu.messagelabs.com[85.158.142.99] said: 553-you are trying to use me [server-18.tower-224.messagelab 553-s.com] as a relay, but I have not been configured to 553-let you [YYY.YYY.YYY.YYY, XXXXX.com] do this. 553-Please visit www.symanteccloud.com/troubleshooting for 553-more details about this error message and instructions 553 to resolve this issue. (#5.7.1) (in reply to RCPT TO command))