Guide
Five minutes per inbox. You create a revocable app password, paste it into CraftNudge, and it verifies the connection before you send a thing.
App passwords do not exist without it. On the Google account you send from, open Security and switch on 2-Step Verification.
Go to your Google account's App Passwords page, name it “CraftNudge”, and copy the 16-character code. It is shown once; you can always create another. This is not your login password — it is a separate, revocable credential.
In CraftNudge, open Inboxes → Connect inbox, paste the email and the app password. Defaults for Gmail are pre-filled. Hit connect and it tests sending and reading straight away.
You want SMTP ok and IMAP ok. If IMAP fails, enable IMAP in that mailbox (Gmail → Settings → Forwarding and POP/IMAP). If SMTP fails with an authentication error, you almost certainly pasted your normal password instead of the app password.
Each inbox is a separate Google account and needs its own app password. Connect as many as you send from; CraftNudge rotates across them.
Sending works the moment an inbox connects, but landing depends on your domain being set up to be trusted. Confirm these three records exist on each sending domain.
A TXT record authorising Google to send for your domain, e.g. v=spf1 include:_spf.google.com ~all.
Enabled in the Google Admin console and published as the matching TXT record, so your mail is signed.
At minimum v=DMARC1; p=none; so receivers know a policy exists. Tighten later once you have clean history.
Keep first sends slow — 30 to 50 a day per inbox — and let volume grow with your reputation. See the sending-limits guide for why.