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Email

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tpspFrom sender for third-party providers

Send Email and Send Email With Template accept an optional tpspFrom sender. Emails delivered through a third-party sending provider (SendGrid, Amazon SES, Mailgun, SparkPost, Postmark or Custom SMTP) go out as tpspFrom; emails delivered on SendPost IPs still go out as from.
  • tpspFrom must be on the same registered domain as from, and must be set up as a sender at the provider.
  • Stats and webhook events stay under from.
  • An invalid tpspFrom rejects the request with HTTP 400 and errorCode 11.
Existing integrations are unaffected: without tpspFrom, sending works exactly as before.
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v1 contract

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Versioned response contract (legacy → v1)

The public REST API now supports two response contracts, selected per request with the X-SendPost-Public-Contract header.
  • legacy (today’s shape) remains the default — existing integrations are unaffected.
  • v1 is available now via X-SendPost-Public-Contract: v1.
  • Responses carry Deprecation, Sunset (31 March 2027, 23:59:59 UTC), and Link headers. After the sunset, v1 becomes the default.
See API Versioning & Migration for the mechanism and step-by-step migration.

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What v1 changes, field by field

v1 normalizes field casing, removes internal/sensitive fields, and adds a few new fields. The complete diff per resource:
  • Added: reasonText — public reason label (manual / unsubscribe / hardBounce / spamComplaint / unknown).
  • Removed: groups, ipId, accountIPPoolId (plus dashboard-only ipPublicIP, ipPoolName).
  • Note: smtpError is unchanged (already camelCase in legacy — it is not renamed).
  • Added: autoWarmupEnabled (boolean; computed from warmup state).
  • Renamed: publicIP → publicIp, reverseDNSHostname → reverseDnsHostname.
  • Removed: systemDomain, accountIPPools, autoWarmupPlan (replaced by autoWarmupEnabled), deliverabilityPolicies, and all per-provider settings blobs (gmailSettings … checkpointSettings).
  • Sub-account pools: add shouldOverflow, overflowPoolName. No removals.
  • Account pools: removed thirdPartySendingProviders, toAccountIPPools, warmupInterval, warmupIntervalSeconds, warmupQueueMode, resolveTemplateLocally.
  • Nested ips[] follow the IP changes above.
  • Added: dnsProvider (detected DNS host).
  • Removed: gpt, gptVerified, dkimDelegationInfo, dmarcDelegationInfo, returnPathDelegationInfo, trackDelegationInfo.
  • Unchanged under v1: the domain/v2 endpoints (/subaccount/domain/v2, /account/domain/v2) return the same shape for legacy and v1.
  • Renamed: messageID → messageId, subAccountID → subAccountId, publicIP → publicIp.
  • Removed: customFields, resolveTemplateLocally (plus internal-plumbing fields already hidden from legacy).
  • Renamed: eventID → eventId, messageID → messageId, messageSubject → subject.
  • Removed (top-level): smtpCode, smtpDescription (still available nested under eventMetadata), plus mock-send flags.
  • eventMetadata: renamed clickedURL → clickedUrl, trackedIP → trackedIp, cityID → cityId; removed sendpostLinkId and all provider-specific fields (sendgrid*, ses*, sparkpost*, mailgun*, customSmtp*, postmark*).
  • Removed: smtpAuths, blocked_at, hb_exempt, generate_weekly_report, skip_global_suppression_check, handlers (plus block_reason, created_by, updated_by already hidden from legacy).
  • apiKey, accountId are unchanged.
  • Renamed: url → logoUrl.
  • Removed: isForbidden, notesColor, twoFactorEnabled, twoFactorVerifiedAt (plus firebaseUID, isGodMode already hidden from legacy).
  • Removed: secret (HMAC signing key), eventSubOptions. secret remains available on the legacy contract for same-account callers.
  • List variant (successRate): v1 always returns a number; legacy returns null when unmeasured.
  • Renamed: logoURL → logoUrl.
  • Removed: all billing internals (stripe*, creditBalance, promoCode, isLegacyBilling, trialPeriod, …), moderation/ops fields (demoLocked*, *SlackEndpoint, slackToken, rbacEnabled, hubspotCompanyId, …) and audit fields. Public callers already receive the curated v1 shape today.
  • EmailResponse: no field changes (to, submittedAt, messageId, errorCode, message).
  • Request body: the TPSP routing internals tpspIppool, tpspTemplate, tpspIp are not part of the v1 shape.
Pervasive v1 changes across the stat family:
  • Removed everywhere: the bot/human breakdown botOpened, botClicked, humanOpened, humanClicked; the ops-only spamRate, totalQD, warmupVersion, warmupSkipped; and the raw day / month / year date columns.
  • Renamed: publicIP → publicIp, ipid → ipId; provider stats email_type → emailType (and email_type/name → provider on the provider breakdown); sub-account stats sid → subAccountId, name → subAccountName; account IP-pool stats accountIPPoolId → ipPoolId, name → ipPoolName.
  • seedContactStats nested keys renamed: rStat → rStats, agStat → groupStats, agDomainStat → domainStats, aIPStat → ipStats, aPStat → providerStats.
  • blacklistResource normalized from Snake_Case/PascalCase to camelCase throughout (Add_Date → addDate, Last_Check → lastCheck, Contact_List_ID → contactListId, etc.).
  • ?filter=bot returns a normalized { enabled, raw, filtered, botOpened, botClicked } view under v1.
  • Unchanged: dateStat, validationStat, accountCycleUsage, postmasterDomainStat.
For the authoritative response of any endpoint under v1, the schema on that endpoint’s API Reference page is the source of truth.