Mails From Exchange 2013 are received as SPAM

Hello,
We have Exchange 2013 configured to send and receive mails internally and externally. Everything is going great except the fact that the mails sent FROM our Exchange 2013 are received as SPAM. For example, I send an email from exchange to my gmail account
(generally to any EXTERNAL receipt). I receive the mail in the SPAM folder.
Any ideas Please !!

Hi,
Firstly, I’d like to recommend you find out exactly what the problem is and resolve it before bothering to delisting from the blacklist.
And based on my knowledge, there are the following reasons:
1. Exchange Server is pumping out SPAM emails because a mailbox password was compromised:
Please figure out which mailbox user is the culprit by looking over event viewer logs and change the password. Then clear email queue and see if any new spam emails are generated, if the change of password stops the flow of SPAM email, we can remove the domain
name from the blacklist.
2. One of our computers are infected with a mass mailing worm virus:
We can check our firewall log
For information about removing from blacklist, you can refer to the following similar thread:
http://social.technet.microsoft.com/Forums/en-US/b3b818a6-641a-4264-87ca-fa4183ffc50c/how-to-remove-my-ip-address-fro-blacklist?forum=exchangesvrsecuremessaginglegacy
If you have any question, please feel free to let me know.
Thanks,
Angela Shi
TechNet Community Support

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