To prevent service abuse and spam, limits are applied to the number of emails that can be sent within any given day or part thereof.
Maximum daily limit: 300 emails / recipients.
Further short-term rate limits may also be enforced.
These are the maximum limits. For individual cases, the maximums can be restricted further because of: The reputation of the sender, The reputation of the IP address used by the sender, and the result from our spam filters (the more likely it is spam the fewer emails it will allow through).
Error messages indicating rate limiting has been applied include messages similar to:
You've reached your sending limit. Don't worry you can send again soon.
Fatal error sending message 451 policy- SC01
An error occurred while sending mail. The mail server responded: too many recipients.
Delivery has failed to these recipients or groups: email@null.null A problem occurred during the delivery of this message. Please try to resend the message later.
If you receive an error when sending an email you believe is legitimate, firstly retry after a few hours. If you continue to receive errors, please contact our support team.