Import external accounts for warming

Import email accounts from external providers (Google Workspace, Microsoft 365, custom SMTP) and immediately enable warming on them. Accounts are created in Firestore with type: "external" and warming campaigns are set up in the provider.

Warming is billed at import time (see /v1/warming/enable): importable accounts are charged a full month upfront before any are connected, net of unfulfilled credit — dashboard flows that already charged via Stripe are not charged again. A payment failure returns 402 and nothing is imported. Send batches of up to 5 accounts per request to avoid API Gateway timeout.

Provider defaults (auto-filled when provider is google or microsoft):

• Google: smtp.gmail.com:465, imap.gmail.com:993
• Microsoft: smtp.office365.com:587, outlook.office365.com:993
• SMTP: all host/port fields required from the request