SMTP Error 220 - Service ready. | Warmup Inbox
The short answer
Service ready. Common cause: The greeting the server sends when you connect.
Quick fix
Nothing to do — it means the server is up and ready for commands.
2 - Success. Not an error - the server accepted or completed the action.
How to fix it
Nothing to do — it means the server is up and ready for commands.
Related codes
211 System status or help reply.
214 Help reply.
221 Service closing transmission channel.
235 Authentication successful.
250 Requested action completed.
251 User not local; will forward.
Ready when you are
Most rejections come back to sender reputation.
Blocklists, auth failures, and policy blocks are what warmup prevents. Warm up your domain so your mail is trusted before you hit send.