+import type SMTPTransport from 'nodemailer/lib/smtp-transport/index.js'
import { smtpClientPool } from './pool.js'
const tos = ['bar@example.com, baz@example.com']
-const smtpClientPoolPromises = new Set<Promise<unknown>>()
+const smtpClientPoolPromises = new Set<Promise<SMTPTransport.SentMessageInfo>>()
for (const to of tos) {
smtpClientPoolPromises.add(
smtpClientPool.execute({