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I found two of the email addresses that you are using as recipient in our bounce list, below are the email addresses and the reason of each one to be in our bounce list:
c*****t@p*********0.org - Reason(s) : smtp;550 5.1.1 - has sent to too many recipients this hour. IB607
a****a@p*********0.org - Reason(s) : smtp;550 5.1.1 - has sent to too many recipients this hour. IB607
I have removed both email address from our bounce list and you should receive your emails now, I would like to share you the limit on emails that an account can receive/send:
Limits on emails sent per accounts:
Free accounts: 20/hour
Paid accounts: 100/hour
Do get back to us if this still persists.