Dear All,

i have configure ZCS 8.0 at my office for mass mailing i am able to send mail to yahoo and rediff but i am sending mail to gmail at that time i got below error

This is the mail system at host

I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can delete your own text from the attached returned message.

The mail system

<>: host[]
said: 550-5.7.1 [ 1] Our system has detected an
unusual rate of 550-5.7.1 unsolicited mail originating from your IP
address. To protect our 550-5.7.1 users from spam, mail sent from your IP
address has been blocked. 550-5.7.1 Please visit
Bulk Senders Guidelines - Gmail Help to review 550 5.7.1 our Bulk
Email Senders Guidelines. h5si14009801paz.102 - gsmtp (in reply to end of
DATA command)