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If you have seen bounceback Express error codes, this blog post will help.
is an email conversion failure where the email service agent informs the sender’s mail that their speech could not be successfully delivered to the intended recipient due to a new serious error.
The two most common errors in category 1a are delays (400) fatal or failures (500).
The 400 error rule is so delayed that the ship’s server will try to deliver the message again.
The 500 error code is your own message, which was not delivered mainly due to an error.
Most Of These Codes Are Standard SMTP Error Codes For Returning Email.
101 – A non-Internet computer can connect. (Connection failed or invalid server name)
111 – Connection failed or unable to enter SMTP stream. Issue (connection containing remote SMTP server, firewalls, or possibly misspelled domains)
211 – System Status via System Help Response (Server Information)
214 – HELP Command (Server FAQ)
220 – Server ready.
221 – Server closes connection while transmitting channel< br>250 – Requested email action done OK Will (email User, delivered)
251 – Nearby, forward path From (action transmission)
252 Error – “Authenticate user, but application tried for a while
253 – Pending messages initiated by host
354 – “Prevent incoming mail from starting
355 – byte offset handled by map offset
420 – Connection timeout problem with (recipient software or hardware problem)
421 Exceeded – Service credit limit for concurrent connections not available
422 – The service storage space in the recipient’s mailbox is full.< 431 - Out of memory
432 – Recipient’s Exchange server stopped for incoming mail
441 – Recipient’s server is down when an email arrives from it.
442 – Connection established (network connection problem caused by router)
446 – Maximum number of hops exceeded (external)Dinner Cycle)
447 Outbound – Message has expired on the incoming server.
449 – Routing error.”
450 “The requested email was not delivered. The message was unreachable. Request denied (broken mailbox, possibly on a hosted standalone server, IP address issues, or blacklisting).
452 – Too many emails sent to too many recipients.
453 – No mail
. 454 – TLS is not available if you need a temporary reason. Requested Authentication mechanism requires encryption
Message 458 – Nodes cannot be aligned
459 Nodes – Currently not allowed: Cause
471 – Local spam protection solves the problem.
Syntax error – 500, Failed to locate device
501 – Syntax error in rules or arguments
502 – Command not implemented with confidence
503 ” ” Invalid request order (authentication required)
504 – command parameters but not implemented
510/511 – check the recipient address for completeness
512 – DNS error, domain cannot be found
515 – invalidth destination mailbox
517 address – Problem with sender email attribute, check properties
521 – Domain not accepting email
522 “” “Recipient understands mailbox limit exceeded
523 – Exceeded reduction in the number of servers Large message
530 Access denied Authentication – Required
531 Mail template completed
533 There is not enough CD space on the remote server to store emails
534 The authentication mechanism is too Weak Too large
message 535 – Multiple identical servers with IP Authentication required
538 – Requested authentication mechanism requires encryption
540 – Non DNS server email address
541 – Has No response from host
542 – Connection
543 Routing server error – Route unreachable
546 – Email loop
547 – Delivery timed out
550 Request – Request not accepted: mailbox available
>551 – The user is not local; Please try way down
552 Requested – Email action canceled: mail exceeded youmemory division
553 Requested – Action failed: mailbox name not allowed
554 – Email transaction failed, incoming server thinks it may be your spam email address or your primary blacklisted ip address .
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