npm / resend
resend
What changed in resend 6, from its official release notes, upgrade guides and advisories. Sources checked 2026-10-21.
2 breaking3 new APIs and options7 fixes and other
See which of these apply to your code, ranked, in your agent:
npx @unstale/cli initresend 612 changes
Breaking changes 2
Inbox fields were renamed.
Requests with dot segments in their paths are rejected.
New APIs and options 3
Inbox operations now accept email addresses.
Inbox label endpoints were added.
Inboxes endpoints were added to the SDK.
Fixes and other changes 7
Search and update draft types now match the API.
Rendering React emails no longer mutates the batch payload.
Inbox label colors now accept plain strings.
The created_at field is typed on list and get inbox responses.
Publish chains preserve error response headers.
The inbox agent tone is typed as one of the presets.
The updated_at field is typed on list and get inbox responses.