Segments that stay honest
Build match-all / match-any segments with live counts so targeting never surprises you at send time.
Saved segments should be boringly reliable.
Prefer explicit rules
Combine status, tags, engagement windows, and custom fields. Name segments after the job they do, not the query syntax.
Trust live counts
Maildrill recalculates match counts as you edit. If the count looks wrong, the rule is wrong — fix it before save.
Reuse across channels
The same segment can power email today and SMS tomorrow. That is the point of one shared audience.