ip_maxmessages verifiedcriticalWritten by the Hub
Messages per minute from one address to one domain
The per-address half of the limits: the same six quantities, counted for the pair of sending address and destination rather than for the destination alone.
In detail
The family is exact: ip_maxmessages, ip_maxconnections, ip_maxconnects, ip_maxconnecting, ip_maxidle, ip_maxbytes mirror their domain_* counterparts, with the same defaults — zero for counts, one for connecting and idle, minus one for bytes. The distinction is what makes warm-up possible on a multi-address node. A domain limit says "this receiver gets no more than N a minute in total"; an address limit says "each of my addresses gets no more than N to it". A new address warming up needs the second, while the first protects the receiver from the sum of all of them. Both apply at once, and the stricter wins — which is the useful behaviour, but it is also why a warm-up plan that writes only address limits can be silently capped by a domain limit somebody set earlier.