User is being blocked in office 365 while Sending Emails Through Zoho CRM

User is being blocked in office 365 while Sending Emails Through Zoho CRM

Hi, We started using office 365 a few months back.

We are using Zoho CRM, we have configured office 365 as IMAP in ZOHO CRM so all our emails are synced and we can send emails from CRM itself.

We send one-to-one emails from ZOHO CRM and we are hardly sending 40 to 50 emails in a day.

Problem: Whenever we try to send an email from CRM, Office 365 detects the user as Suspicious, sends alter to us, and then blocks the user from sending emails. Here is a message from office 365 "User has been restricted from sending messages outside the organization due to potentially compromised activity."

We have verified DKIM, SPF records, and even configured email Relay, and we are not sending any SPAM or malicious emails. Even we are not breaking limits set by exchange online/office 365.

We are in touch with the support of office 365 and even with Zoho CRM for many days but seems the Zoho team is unable to solve this, and blaming it on office 365. If its a problem related to office 365 then email we send from outlook should also not work but it works. Previous to Zoho we were using HUbspot and we never faced these issues.


The problem seems here is: That office365 machines/server or Exchange has detected Zoho servers as spam and that is why we try to send email from CRM, it does not allow us to send email from exchange online protection. We are facing this problem from many months, we were in continuous touch with Zoho and we have implemented every step you suggested. 

My question is why does Exchange/office365 block a user if the user is not sending mass emails, even not sending any suspicious emails? Can you please solve this issue? if require we are ready to reconfigure things again.

This has affected us a lot to us and we are unable to fully utilize our CRM platform despite paying a hefty amount for many of our users.


Thank you
Keshu