Sending mail to yahoo gets dropped/blocked

[sr_grmtech]

I am facing similar problem. From our mail server outgoing emails are ok for gmail and others. However, when I am trying to send email to yahoo.com then it is showing mail sent but email is not reaching to the destination. I followed suggestion provided by @uxbod and found our mail server was indeed listed in http://www.anti-abuse.org/multi-rbl-check/ . Requested to un-block our mail server and now it is unblocked. Unfortunately my problem is not fixed yet. still my emails are not reached to yahoo mail. checked spam/junk in yahoo mail and it is empty. Please help me to fix this.

[yeeP6rai]

What is in your log file? Pls see in /var/log/zimbra.log about errors while sending to user@yahoo.com

[fayaz]

hi

check the spamming user and change his password immediately .

https://wiki.zimbra.com/wiki/Spamming_troubleshooting