Undeliverable and Bounced Emails
On Striata servers, an Undeliverable email message status indicates that the recipient’s mail server could not be reached or never accepted delivery of the email message. A Bounced email message status indicates that the recipient’s mail server originally accepted delivery of the email message, but later returned it to the sender because it could not be delivered.
OverviewThe most Common Reasons a Message could not be delivered:
- Invalid mailbox address – the “name” portion of the email address is invalid ( This email address is being protected from spambots. You need JavaScript enabled to view it. )
- Invalid mailbox address – the “name” portion of the email address is invalid ( This email address is being protected from spambots. You need JavaScript enabled to view it. )
- Recipient’s mailbox is full
- Recipient’s mail server is not responding or returning errors
For each message batch, the Striata server provides an SMTP Log and a Bounce Log (seethe Striata Messaging Engine Training Manual). The SMTP and Bounced logs can become very technical in nature. Various mail systems can return SMTP numerical coding which may or may not include extended codes and descriptions. Below are some common SMTP codes and meanings.
| Code | Description |
| 200 | Non-standard 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> |
| 354 | Start mail input; end with <CRLF>.<CRLF> |
| 421 | <domain> Service not available - closing transmission channel |
| 450 | Requested mail action not taken: mailbox unavailable |
| 451 | Requested action aborted: local error in processing |
| 452 | Requested action not taken: insufficient system storage |
| 453 | You have no mail |
| 454 | TLS not available due to temporary reason. Encryption required for requested authentication mechanism |
| 458 | Unable to queue messages for node <node> |
| 459 | Node <node> not allowed: <reason> |
| 500 | Syntax error - command unrecognized |
| 501 | Syntax error in parameters or arguments |
| 502 | Command not implemented |
| 503 | Bad sequence of commands |
| 504 | Command parameter no implemented |
| 521 | <domain> does not accept mail (see rfc 1846) |
| 530 | Must issue a STARTTLS command first. Encryption required for requested authentication mechanism. |
| 534 | Authentication mechanism 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 |
References for additional SMTP code translations:
"Striata continuously assist us in building our brand and getting our message across to our supporters and beneficiaries. Their willingness to help us succeed in growing our database and creating better eMarketing campaigns has been unbelievable."
