client.traffic()
Every method in this namespace: its signature, its parameters, what it returns and an example.
Methods
What happened to every message at the edge of the workspace: where the mail that arrived for your addresses went, and what the receiving server said about the mail you sent.
traffic().list
List one page of the traffic log
Page list(RequestOptions options)Returns one page of the traffic log, newest first: one entry for each message and recipient at each step it took in or out of the workspace. listAll collects every page and iterate walks them lazily.
Inbound, each recipient of a message that arrived gets an entry saying where it went: filed in the inbox, spam, routed to a webhook, forwarded without a copy kept, refused with a bounce back to the sender, or dropped without one, and reason says why mail was refused or dropped. Outbound, each recipient of a message you sent or forwarded gets an entry for each answer from the receiving server: delivered, deferred while it keeps trying, bounced, complained, suppressed when it was never tried, rejected when it was refused before it left, and failed for a forward that could not be relayed.
An entry never changes once it is written, and the same step keeps the same id. Entries are kept for 30 days. detail holds the reply of the receiving server and remoteMta, reportingMta and sendingIp the servers on each side, and inbound entries carry the SPF, DKIM, DMARC, spam and virus verdicts the message arrived with.
Parameters
options.domainIdStringKeeps one domain, by the id
domains().listreturns. A domain the key does not reach is a 404.options.directionStringinboundfor mail that arrived,outboundfor mail the workspace sent or forwarded. Left out, both, as far as the key's scopes reach.sh.nextmail.constants.TrafficDirectionsholds the values.options.outcomesString or List<String>Keeps these outcomes, such as
bouncedanddeferred.sh.nextmail.constants.TrafficOutcomesholds the values.options.addressStringKeeps one of your addresses: the one the mail arrived for, or the one it was sent from.
options.recipientStringKeeps one recipient, matched whole: the person you wrote to on an outbound entry, the address in the envelope on an inbound one.
options.sinceInstant or StringKeeps entries at or after this instant.
options.untilInstant or StringKeeps entries before this instant. It must be later than
since.options.limitintPage size, from 1 to 100. The server defaults to 25.
options.cursorStringThe
nextCursorof the previous page. Leave it out for the first page.options.apiKeyStringOverrides the client API key for this call only.
Returns
A Page of maps with items, hasMore and nextCursor. Each item has direction, outcome, reason, status, detail, sender, recipient, address, domain, the ids of the email and thread it belongs to, the servers on each side, verdicts, size and createdAt.
Example
Page page = client.traffic().list(RequestOptions.create() .set("direction", TrafficDirections.OUTBOUND) .set("outcomes", List.of(TrafficOutcomes.BOUNCED, TrafficOutcomes.DEFERRED)) .set("since", Instant.now().minus(Duration.ofDays(1)))); for (Map<String, Object> entry : page) { System.out.println(entry.get("createdAt") + " " + entry.get("recipient") + " " + entry.get("outcome") + " " + entry.get("detail"));}Notes
Outbound entries need
emails:readand inbound onesthreads:read. A key with only one of them sees that direction alone, and asking for the otherdirectionis a 403insufficient_scope.A key or an app narrowed to particular addresses or domains sees the entries of the addresses it reaches and, for a whole domain it holds, every entry of that domain, including mail for addresses that do not exist.
The sender and the reply are stored encrypted, so they cannot be searched. Filter by
address,recipient,outcomes,direction,domainIdand the time.The cursor is opaque and holds where the last row sat. A cursor this list did not hand out is a 400
invalid_cursor.
Also available in
- API
GET /traffic- TypeScript
traffic.list()- Python
traffic.list()- Ruby
traffic.list- PHP
traffic->list- Go
Traffic.List- C#
Traffic.ListAsync- CLI
nextmail traffic list
traffic().listAll
Collect the traffic log into one list
List<Map<String, Object>> listAll(RequestOptions options)Walks every page of list and returns every entry that matches in one list, newest first. One request per page, with the same filters on each, so narrow it with since, domainId or outcomes before collecting a busy workspace.
Parameters
options.domainIdStringKeeps one domain, by the id
domains().listreturns. A domain the key does not reach is a 404.options.directionStringinboundfor mail that arrived,outboundfor mail the workspace sent or forwarded. Left out, both, as far as the key's scopes reach.sh.nextmail.constants.TrafficDirectionsholds the values.options.outcomesString or List<String>Keeps these outcomes, such as
bouncedanddeferred.sh.nextmail.constants.TrafficOutcomesholds the values.options.addressStringKeeps one of your addresses: the one the mail arrived for, or the one it was sent from.
options.recipientStringKeeps one recipient, matched whole: the person you wrote to on an outbound entry, the address in the envelope on an inbound one.
options.sinceInstant or StringKeeps entries at or after this instant.
options.untilInstant or StringKeeps entries before this instant. It must be later than
since.options.limitintPage size for each request, from 1 to 100. The server defaults to 25.
options.cursorStringStarts the walk after this cursor instead of the first page.
options.apiKeyStringOverrides the client API key for every page of this walk.
Returns
A List<Map<String, Object>> holding every matching entry.
Example
List<Map<String, Object>> bounced = client.traffic().listAll(RequestOptions.create() .set("outcomes", List.of(TrafficOutcomes.BOUNCED)) .set("since", "2026-10-01T00:00:00Z") .limit(100)); Set<Object> recipients = new TreeSet<>();for (Map<String, Object> entry : bounced) { recipients.add(entry.get("recipient"));} System.out.println(recipients);Notes
If any page fails, the exception is thrown and the entries already fetched are discarded.
Outbound entries need
emails:readand inbound onesthreads:read, as onlist.
Also available in
- API
GET /traffic- TypeScript
traffic.listAll()- Python
traffic.list_all()- Ruby
traffic.list_all- PHP
traffic->listAll- Go
Traffic.ListAll- C#
Traffic.ListAllAsync
traffic().iterate
Stream the traffic log one entry at a time
PagedIterable iterate(RequestOptions options)Returns an iterable that yields one entry at a time, newest first, and requests the next page only once the current one is drained. Nothing is fetched until you consume it, and breaking out of the loop stops the requests.
Parameters
options.domainIdStringKeeps one domain, by the id
domains().listreturns. A domain the key does not reach is a 404.options.directionStringinboundfor mail that arrived,outboundfor mail the workspace sent or forwarded. Left out, both, as far as the key's scopes reach.sh.nextmail.constants.TrafficDirectionsholds the values.options.outcomesString or List<String>Keeps these outcomes, such as
bouncedanddeferred.sh.nextmail.constants.TrafficOutcomesholds the values.options.addressStringKeeps one of your addresses: the one the mail arrived for, or the one it was sent from.
options.recipientStringKeeps one recipient, matched whole: the person you wrote to on an outbound entry, the address in the envelope on an inbound one.
options.sinceInstant or StringKeeps entries at or after this instant.
options.untilInstant or StringKeeps entries before this instant. It must be later than
since.options.limitintPage size for each request, from 1 to 100. The server defaults to 25.
options.cursorStringStarts the walk after this cursor instead of the first page.
options.apiKeyStringOverrides the client API key for every page of this walk.
Returns
A PagedIterable yielding one entry per step.
Example
RequestOptions refused = RequestOptions.create() .set("direction", TrafficDirections.INBOUND) .set("outcomes", List.of(TrafficOutcomes.REFUSED, TrafficOutcomes.DROPPED)); for (Map<String, Object> entry : client.traffic().iterate(refused)) { System.out.println(entry.get("recipient") + " " + entry.get("reason") + " " + entry.get("detail"));}Notes
The iterable is lazy, so an abandoned loop costs only the pages you consumed.
Outbound entries need
emails:readand inbound onesthreads:read, as onlist.
Also available in
- API
GET /traffic- TypeScript
traffic.iterate()- Python
traffic.iterate()- Ruby
traffic.iterate- PHP
traffic->iterate- Go
Traffic.Iterate- C#
Traffic.IterateAsync
Google Workspace