Good evening and welcome to the Rogers Community Forums @diqs1986,
I know how important it is to be able to send and receive emails without any issues. While I wasn't able to replicate the same issue on my end, I did do a quick Google search and found a few reasons that may cause this error to come up.
It seems like your email account may have been marked as spam. Here's a few reasons why this could happen:
1)Sending emails in bulk within a short period of time
2)Sending a lot of emails withing a short period of time
3)Sending the same email to a large number of recipients
Depending on what may have caused this I would recommend you to maybe change your email password to see if it resolves the issue for you.
You can change the password under Account Info >> Account Security >> Change Password.
Please keep us posted on the outcome.
RogersZia