- smtpd_hard_error_limit = 30
This means that a domain can have a total of 30 simultaneous connections.
- smtpd_client_connection_rate_limit = 10
This means that a domain can make 10 connections every 60 seconds.
- smtpd_soft_error_limit = 25
If HES is to deliver emails to 25 recipient domain names that we do nslookup on, then it starts adding a delay between command lines.
- smtpd_client_connection_count_limit = 30
After 30 nslookup failures, IMHS closes that connection and the domain can immediately make another connection.
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"421 4.7.0 Error: too many connections" appears when sending emails through Hosted Email Security (HES)
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