Get statistics by recipient domain
Returns delivery and engagement counts for the requested period, grouped by recipient mailbox domain: the part of each recipient address after the @, for example gmail.com, yahoo.com, or outlook.com. This is the finest-grained deliverability view. Where the mailbox-provider breakdown groups recipients into provider buckets such as gmail or microsoft, this keys on the exact destination domain. Use it to spot a delivery-rate dip or a complaint spike at a specific domain.
Rows are ranked by the sort metric, processed by default, and paginated with the requested limit (50 by default, 200 at most). Rows are computed against event time rather than send time, so engagement received during the period counts even for messages that were sent earlier.
The window can span at most 365 days. Ask for more and you get a 422.
Request
- Base URL: https://us1.platform.bird.com
- URL: https://us1.platform.bird.com/v1/email/stats/recipient-domains
- Auth: one of:
- HTTP bearer
- API key in cookie bird_session
Query parameters
Cursor from the next_cursor field of a previous list response. Returns items immediately after the cursor position in the current sort order.
Cursor from the prev_cursor or refresh_cursor field of a previous list response. Returns items immediately before the cursor position in the current sort order. prev_cursor returns the preceding page. refresh_cursor anchors at the first row of that response, which on a newest-first sort is how to fetch the items that have appeared since.
Start date (inclusive) in YYYY-MM-DD, interpreted as a calendar day in timezone (a UTC day when timezone is omitted). It defaults to 30 days before to when you leave it out. When include_trend=true and trend_grain=hourly, that default tightens to 29 days before to instead, so the defaulted window still fits inside the 720-hour trend cap.
End date (inclusive) in YYYY-MM-DD, interpreted as a calendar day in timezone (a UTC day when timezone is omitted). Defaults to today in that timezone when omitted. Window may not exceed 365 days.
IANA timezone identifier used to group statistics, for example Asia/Kathmandu. The default is UTC. Day and hour boundaries, including the default window when from and to are omitted, follow this timezone. When this parameter is set, pass from and to as calendar days or Z instants instead of timestamps with explicit UTC offsets.
Not supported on breakdown endpoints. Supplying it returns 422. To compare categories, use GET /v1/email/stats/categories. The summary, daily, and hourly statistics accept category as a filter.
Metric to rank breakdown rows by, applied descending. Shared by the breakdowns whose rows have the full delivery, engagement, and latency block: tags, sending domains, categories, recipient domains, templates, and broadcasts. Any count or rate can be used. A row whose rate is undefined, because its denominator was zero, sorts last. A bounce sub-type is nested under bounces in each row, so its sort name reflects that, for example bounces.hard and bounces.hard_rate. oob_bounces is distinct from bounced: it counts out-of-band bounces, failure notifications that arrive after delivery was already confirmed.
Metric to rank rows by, applied descending. Any count or rate in the response can be used. A row whose rate is undefined because its denominator is zero sorts last. It defaults to processed.
Maximum number of recipient-domain rows to return, ranked by the sort field descending.
When true, each row also gets a trend array: a short per-bucket series showing that recipient domain's delivery and engagement rates over the window. This only works when limit is 50 or fewer and the window is at most 90 days for trend_grain=daily or 720 hours for trend_grain=hourly. Ask for more and you get a 422. When you leave from out and use trend_grain=hourly, the default window tightens to 29 days before to (720 hours total), so a request built entirely from defaults always fits inside the cap.
Bucket grain for a stats trend series.
Bucket grain for the trend series. Has no effect unless include_trend=true.
Headers
Workspace context for the request. Required for dashboard authentication and master keys. Workspace keys and access tokens already identify their workspace; send that workspace or omit the header. A different one is rejected.
Organization context for the request. Required for dashboard authentication. An API key or access token carries its own organization, so send either that organization or no header at all; a different one is rejected.
Response
Per-recipient-domain breakdown for the requested period.
Example response
{
"period": {
"from": "2026-05-01",
"to": "2026-05-25",
"data_as_of": "2026-05-25T14:03:10Z"
},
"data": [
{
"recipient_domain": "gmail.com",
"delivery": {
"accepted": 14820,
"processed": 14810,
"delivered": 14720,
"bounced": 90,
"bounces": {
"hard": 12410,
"soft": 14290,
"admin": 410,
"block": 920,
"undetermined": 80,
"hard_rate": 0.454,
"soft_rate": 0.523,
"admin_rate": 0.015,
"block_rate": 0.0337,
"undetermined_rate": 0.0029
},
"complained": 3,
"deferred": 14,
"rejected": 10,
"oob_bounces": 2,
"effective_delivered": 14718,
"all_bounces": 92,
"oob_rate": 0.00014,
"delivery_rate": 0.9939,
"bounce_rate": 0.0061,
"complaint_rate": 0.0002
},
"engagement": {
"opens": 5420,
"opens_non_prefetched": 3210,
"unique_opens": 3640,
"unique_opens_non_prefetched": 2480,
"clicks": 924,
"unique_clicks": 621,
"unsubscribes": 12,
"open_rate": 0.1683,
"click_rate": 0.0422,
"unsubscribe_rate": 0.0009
},
"latency": {
"processing": {
"p50_ms": 420,
"p95_ms": 1820,
"p99_ms": 4920
},
"delivery": {
"p50_ms": 420,
"p95_ms": 1820,
"p99_ms": 4920
},
"total": {
"p50_ms": 420,
"p95_ms": 1820,
"p99_ms": 4920
}
},
"trend": [
{
"bucket": "2026-05-12"
}
]
}
],
"total": 412,
"next_cursor": "eyJ2IjoxLCJzIjoiXCIyMDI2LTA1LTI1VDE0OjAzOjEwWlwiIiwiaSI6IjAxOTJmM2IxLTRjN2UtN2EyYi05ZDYxLThmM2E1YzJlN2I0MCJ9",
"refresh_cursor": "eyJ2IjoxLCJzIjoiXCIyMDI2LTA1LTI1VDE2OjQyOjAxWlwiIiwiaSI6IjAxOTJmM2IxLTllMDQtN2NkMy1iODE3LTJhNmY0ZDFjOGUwOSJ9"
}Changes
No recorded changes to this operation across all 2 revisions of this API.