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MailerSpark

Segments

Filter your list
on the fly.

Rule-based dynamic filters with all/any match logic. Live previews of who matches. The same segment powers campaign targeting, automation triggers, and the API.

Start freeContacts & CRM

Live preview · Per-campaign targeting · API access

Rule-based

Build a segment
with any field.

A segment is a set of rules: country equals US, custom.industry in [SaaS, PaaS], opens (30d) ≥ 3. Rules combine with all/any logic. The preview tells you who matches before you send.

  • all / any match
    Group rules with AND or OR. Nest as deep as you need.
  • Any field
    Built-in fields (email, country, last engaged) and your custom fields.
  • Live preview
    /api/segments/[id]/preview returns the current contact count and a paginated list.
Segment · High-intent SaaS leads
ALLcountryequalsUS
ANDcustom.industryinSaaS, PaaS
ANDopens (30d)≥3
2,847 contacts match

Powering everything

One segment,
used everywhere.

Build a segment once. Use it as the recipient list for a newsletter campaign, as a trigger source for an automation, as a filter in a custom field report, or as a query param in the API.

  • Campaign targeting
    Pick a segment instead of a static list. The campaign sees the current matches.
  • Automation triggers
    An automation can fire when a contact enters a segment.
  • API queries
    GET /api/v1/contacts?segment=seg_8a3f returns just that segment's contacts.
Used in 4 places
Newsletter campaign
Target = 'High-intent SaaS leads'
Automation trigger
When a contact enters this segment → send 'VIP offer'
API call
GET /api/v1/contacts?segment=seg_8a3f
Custom report
Revenue by segment (last 30 days)

Starter and above

Segments on Starter and above.

Build your first segment on the free plan trial, then upgrade when you outgrow static lists.

Start freeSee pricing
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