new warmup_routing_rules table + repo + REST endpoints under /warmup/
routing. each rule matches a (sender, recipient) pair by domain, TLD,
provider bucket, or any wildcard, with a weight multiplier on the
selector. weight > 1 prefers the pairing, < 1 discourages, 0 excludes.
rules are evaluated in priority order (ascending) and combined with the
existing domain-diversity weighting. example use case: a customer can
say 'send Gmail-recipient warmup only from Google-classified senders'
with one rule; or 'never send to acme.com from this org's mailboxes'
with weight=0. premium pool only — free pool ignores rules.
extend recent-partner exclusion from 24h to 72h, weight selection by
inverse-frequency of recipient domain over the last 7 days so a single
provider does not absorb the bulk of warmup traffic, and log a warning
when a pool drops below the diversity threshold.
Matthew Meszaros