The AuthSMTP SMTP mail server service is designed to solve many of the problems people have when sending Internet email and is compatible with almost all current email client and server software.
If you do not already have an AuthSMTP account click here or review the features, benefits and low cost.
Here is a reference table of SMTP error / reply codes and a brief description of their meaning:
| Code | Description |
|---|---|
| 211 | System status or system help reply. |
| 214 | Help message. |
| 220 | Domain service ready - ready to start TLS. |
| 221 | Domain service closing transmission channel. |
| 250 | OK - queuing for node started - requested mail action okay, completed. |
| 251 | OK - no messages waiting for node - user not local will forward to forward path. |
| 252 | OK - pending messages for node started - cannot VRFY user but will accept message and attempt delivery. |
| 253 | OK - messages pending - messages for node started. |
| 354 | Start mail input - end with <CRLF>.<CRLF>. |
| 355 | Octet-offset is the transaction offset. |
| 421 | Domain service not available - closing transmission channel. |
| 432 | A password transition is needed. |
| 450 | Requested mail action not taken: mailbox unavailable - ATRN request refused. |
| 451 | Requested action aborted - local error in processing - unable to process ATRN request. |
| 452 | Requested action not taken - insufficient system storage. |
| 453 | You have no mail. |
| 454 | TLS not available due to temporary reason - encryption is required for requested authentication mechanism. |
| 458 | Unable to queue messages for node |
| 459 | Node not allowed: reason. |
| 500 | Command not recognized 'command' - syntax error. |
| 501 | Syntax error - no parameters allowed. |
| 502 | Command not implemented. |
| 503 | Bad sequence of commands. |
| 504 | Command parameter not implemented. |
| 521 | Machine does not accept mail. |
| 530 | Must issue a STARTTLS command first - encryption required for requested authentication mechanism. |
| 534 | Authentication mechanism is too weak. |
| 538 | Encryption required for requested authentication mechanism. |
| 550 | Requested action not taken - mailbox unavailable. |
| 551 | User not local - please try forward path. |
| 552 | Requested mail action aborted - exceeded storage allocation. |
| 553 | Requested action not taken - mailbox name not allowed. |
| 554 | Transaction failed. |
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