3-digit reply code Success

SMTP error 220

Service ready.

Updated Jul 1, 2026

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.
All SMTP error codes
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.

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