Vor kurzem bin ich im MS Technet über eine Liste von Exchange SMTP-Statuscodes mit möglichen Ursachen gestolpert…
Schlagwort: SMTP
Vor einer Weile war in der MailEnable KnowledgeBase eine kompakte Tabelle mit SMTP Statuscodes zu finden. Die Tabelle wurde Anfang 2010 durch einen umfangreichen und sehr detailierten Troubleshooting-Guide ersetzt: ME020032 – INF: SMTP Connector Inbound Response Codes.
Hier die ursprüngliche Tabelle zur einfachen Übersicht:
SMTP Status Codes
Status 2xx „Success“
| Code | Bedeutung |
| 200 | nonstandard success response (see rfc876) |
| 211 | System status, or system help reply |
| 214 | Help message |
| 220 | <domain> Service ready |
| 221 | <domain> Service closing transmission channel |
| 250 | Requested mail action okay, completed |
| 251 | User not local; will forward to <forward-path> |
Status 3xx „Wait for“
| Code | Bedeutung |
| 354 | Start mail input; end with <CRLF>.<CRLF> |
Status 4xx „Temporary Error“
| Code | Bedeutung |
| 421 | Service not available, closing transmission channel |
| 422 | The recipient has exceeded their mailbox limit |
| 431 | Not enough disk space on the delivery server; may be reported as out-of-memory error |
| 432 | the Administrator has frozen the queue |
| 441 | Intermittent network connection, the server has not yet responded |
| 442 | The server started to deliver the message but then the connection was broken |
| 446 | Too many hops. Most likely, the message is looping |
| 447 | Timeout occurred, check server connection |
| 449 | A DNS problem occurred; check your smart host setting on the SMTP connector |
| 450 | Requested mail action not taken: mailbox unavailable |
| 451 | Requested action aborted: local error in processing |
| 452 | Requested action not taken: insufficient system storage |
| 465 | Your server does not have the correct language code page installed |
Status 5xx „Permanent Error“
| Code | Bedeutung |
| 500 | Syntax error, command unrecognized |
| 501 | Syntax error in parameters or arguments |
| 502 | Command not implemented |
| 503 | Bad sequence of commands |
| 504 | Command parameter not implemented |
| 510 | Bad email address |
| 511 | Mailbox not found |
| 513 | Relaying denied or Address type incorrect |
| 514 | Two objects have the same address |
| 515 | Destination mailbox address invalid |
| 516 | Mailbox has been moved |
| 517 | Command violates RFC 821; most likely missing < > around email addresses |
| 521 | Server does not accept incoming mail |
| 522 | Recipient has exceeded their mailbox limit |
| 523 | Recipient cannot receive messages this big |
| 524 | Most likely, a distribution list or group is trying to send an email |
| 530 | Access denied |
| 531 | Mail system full; most likely Exchange database full |
| 532 | System not accepting network messages |
| 533 | Remote server has insufficient disk space to hold email |
| 534 | Message too big |
| 535 | Multiple Virtual Servers are using the same IP address and port; see MS KB321721 „Sharing SMTP“ |
| 540 | There is no DNS server that can resolve this email address |
| 541 | No answer from host |
| 542 | Bad connection |
| 543 | Routing server failure, no route available |
| 544 | Cannot find the next hop, check the Routing Group Connector |
| 546 | Tricky looping problem, a contact has the same email address as an Active Directory user |
| 547 | Delivery time-out |
| 548 | Bad recipient policy |
| 550 | Requested action not taken: mailbox unavailable |
| 551 | User not local; please try |
| 552 | Requested mail action aborted: exceeded storage allocation |
| 553 | Requested action not taken: mailbox name not allowed, possibly more recipients than allowed |
| 554 | Transaction failed |
| 555 | Wrong protocol version |
| 563 | More than X attachments |
| 571 | Permission problem, most likely anonymous user is trying to send mail to distribution list |
| 572 | Distribution list cannot expand |
| 573 | External IP address of ISA server does not match SMTP publishing policy |
| 574 | Extra security features not supported, check delivery server settings |
| 575 | Cryptographic failure, try a plain message with encryption |
| 576 | Certificate problem, encryption level maybe too high |
| 577 | Message integrity problem |
SMTP 550
Der Statuscode 550 (oder 5.5.0) scheint ein Spezialfall mit unterschiedlicher Bedeutung zu sein. Im besten Fall lässt sich über die mitgelieferte Text-Statusmeldung mehr herausfinden, zB. deutet „550 this address is not allowed“ auf einen unauthorisierten Benutzer hin (SMTP-Auth im Email Client vergessen?). Die textuelle Fehlermeldung ist in verschiedenen Email-Serverprodukten meist unterschiedlich formuliert. So bedeuten „550 queue expired“ unter Microsoft Exchange als auch „550 message expired“ unter MailEnable, dass die Nachricht nicht innerhalb der vorgegebenen Zeit zugestellt werden konnte.
Quellen und zusätzliche Informationen:
- RFC 1893: Enhanced Mail System Status Codes
- RFC 2034: SMTP Service Extension for Returning Enhanced Error Codes
- MailEnable KnowledgeBase: ME020032 – INF: SMTP Connector Inbound Response Codes
Die die Erreichbarkeit und grundsätzliche Funktion eines Email-Servers lässt sich recht simpel via Telnet testen.
Achtung: Die Chance ist hoch, dass über Telnet versendete Test-Emails im Spamfilter landen.
telnet mail.server.com 25 220 mail.server.com helo client.pc.com # Name des Absender-Servers 250 OK mail from:thomas@pc.com # Email-Absender 250 OK rcpt to:someone@server.com # Email-Empfänger 250 OK data # Startet Eingabe des eigentlichen Emails 354 Start mail input; end with <CRLF>.<CRLF> Subject:Testmail # eine Leerzeile beendet den Mailheader Testmail Text . 250 OK quit # SMTP-Session beenden 221 Service closing transmission channel
Gelegentlich wurden Emails von unserem MailEnable Email-Server mit der Begründung „SMTP 554: Body type not supported by Remote Host“ abgelehnt. Der Grund dafür lag am „8BitMIME Advertising“ des SMTP-Services unter Windows Server 2003.