'log' — writes each message to the resolved ILogger (and an
optional sink); the zero-dependency default, works on every runtime
including Cloudflare Workers. For testing/local development.
'smtp' — SMTP via nodemailer (injected transport or lazy dynamic
import); Node/Deno/Bun only (raw sockets, not available on Workers).
'ses' — AWS Simple Email Service via @aws-sdk/client-sesv2 (injected
client or lazy dynamic import).
'sendgrid' — SendGrid v3 HTTP API over web-standard fetch
(zero-dependency, Workers-portable).
Supported mail provider backends.
'log'— writes each message to the resolvedILogger(and an optional sink); the zero-dependency default, works on every runtime including Cloudflare Workers. For testing/local development.'smtp'— SMTP vianodemailer(injected transport or lazy dynamic import); Node/Deno/Bun only (raw sockets, not available on Workers).'ses'— AWS Simple Email Service via@aws-sdk/client-sesv2(injected client or lazy dynamic import).'sendgrid'— SendGrid v3 HTTP API over web-standardfetch(zero-dependency, Workers-portable).