Getting the following error across multiple domains:
Deliveries failing with Error:
Messages queued (connection quotas met)
The quotas met message indicates that the email delivery is postponed by the MTA because a certain threshold has been reached while sending.
This threshold is set by the MX management rules under Administration
> Campaign Management
> Non-deliverables Management
> Mail rule sets.
It is a safety measure to prevent IP blacklisting.
There’s a possibility that the thresholds are too low, but that’s a question for a deliverability expert to answer.
If the TLS parameter is not set, it will default to the value in the
serverConf.xml file (
enableTLS), which is false by default. Though the purpose of TLS is mainly confidentiality, it is possible that this parameter plays a role in deliverability. Connect with a support agent to get clarity.