SMTP and ESMTP Error Code List Updated on November 17, 2023 by InMotion Hosting Contributor 4 Minutes, 5 Seconds to Read It is important to figure out why your email bounces. If you receive an email bounce, you can look in the bounce message to find the proper error code that will give you the reason for the bounce. Below is a list of the Standard SMTP error codes and the Extended SMTP (ESMTP) error codes. SMTP Error Codes This list of codes is the standard SMTP error codes you will find in most email bounces. 200 Codes 211 – System status / system help reply 214 – Help message 220 – Domain service ready 221 – Domain service closing transmission channel 250 – Requested mail action completed and OK 251 – Not Local User, forward email to forward path 252 – Cannot Verify user, will attempt delivery later 253 – Pending messages for node started 300 Codes 354 – Start mail input; end with . 355 – Octet-offset is the transaction offset 400 Codes 421 – Domain service not available, closing transmission channel 432 – Domain service not available, closing transmission channel 450 – Requested mail action not taken: mailbox unavailable. request refused 451 – Requested action aborted: local error in processing Request is unable to be processed, try again 452 – Requested action not taken: insufficient system storage 453 – No mail 454 – TLS not available due to temporary reason. Encryption required for requested authentication mechanism 458 – Unable to queue messages for node 459 – Node not allowed: reason 500 Codes 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 – Check the recipient address 512 – Domain can not be found. Unknown host. 515 – Destination mailbox address invalid 517 – Problem with senders mail attribute, check properties 521 – Domain does not accept mail 522 – Recipient has exceeded mailbox limit 523 – Server limit exceeded. Message too large 530 – Access Denied. Authentication required 531 – Mail system Full 533 – Remote server has insufficient disk space to hold email 534 – Authentication mechanism is too weak. Message too big 535 – Multiple servers using same IP. Required Authentication 538 – Encryption required for requested authentication mechanism 540 – Email address has no DNS Server 541 – No response from host 542 – Bad Connection 543 – Routing server failure. No available route 546 – Email looping 547 – Delivery time-out 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 Extended SMTP (ESMTP) standards The Extended SMTP error codes work in 3 digit combinations. For example, 5.2.1 is a Permanent Error where the receiving email is not accepting messages. The first number is the email message status. The second 2 numbers pinpoint the exact information bout the error. 2 Successfully sent the email; 4 Temporary problem when sending the email. The email server typically will try to send it again till it reaches retry timeout. 5 Permanent or Fatal error. This can be caused by a non existent email address, DNS problem, or your email was blocked by the receiving server. Below is a list of the Extended SMTP error codes. Note! X can be a 4 or a 5 depending on is its Temporary or Permanent. x.1.x Codes X.1.0 – Other address status X.1.1 – Bad destination mailbox address X.1.2 – Bad destination system address X.1.3 – Bad destination mailbox address syntax X.1.4 – Destination mailbox address ambiguous X.1.5 – Destination mailbox address valid X.1.6 – Mailbox has moved X.1.7 – Bad sender’s mailbox address syntax X.1.8 – Bad sender’s system address x.2.x Codes X.2.0 – Other or undefined mailbox status X.2.1 – Mailbox disabled, not accepting messages X.2.2 – Mailbox full X.2.3 – Message length exceeds administrative limit X.2.4 – Mailing list expansion issue x.3.x Codes X.3.0 – Other or undefined mail system status X.3.1 – Mail system full X.3.2 – System not accepting network messages X.3.3 – System not capable of selected features X.3.4 – Message too big for system X.3.5 – System incorrectly configured x.4.x Codes X.4.0 – Other or undefined network or routing status X.4.1 – No answer from host X.4.2 – Bad connection X.4.3 – Routing server failure X.4.4 – Unable to route X.4.5 – Network congestion X.4.6 – Routing loop detected X.4.7 – Delivery time expired x.5.x Codes X.5.0 – Other or undefined protocol status X.5.1 – Invalid command X.5.2 – Syntax error X.5.3 – Too many recipients X.5.4 – Invalid command arguments X.5.5 – Wrong protocol version x.6.x Codes X.6.0 – Other or undefined media error X.6.1 – Media not supported X.6.2 – Conversion required and prohibited X.6.3 – Conversion required but not supported X.6.4 – Conversion with loss performed X.6.5 – Conversion failed x.7.x Codes X.7.0 – Other or undefined security status X.7.1 – Delivery not authorized, message refused X.7.2 – Mailing list expansion prohibited X.7.3 – Security conversion required but not possible X.7.4 – Security features not supported X.7.5 – Cryptographic failure X.7.6 – Cryptographic algorithm not supported X.7.7 – Message integrity failure Share this Article Related Articles How to Fix the “550 No Such User Here” Email Error How to Setup an Email AutoResponder in cPanel Logging into Horde How to Change an Email Password in cPanel and Webmail How to Purchase InMotion Hosting Professional Email in AMP What is MailChannels and How it Benefits You Email Error – Mailbox Quota Exceeded How to Archive Email Using IMAP Upgrade to iOS6 causing IMAP issues How To Set Up Gmail for POP3 and SMTP
Hi, my name is Christianah Am looking for some help with this which i don’t know how to fix it : 550 5.7.1 This message is rejected by our SPAM filters. Please refer https://support.mailhostbox.com/email-administrators-guide-error-codes/ for more information ‘*********@********’ on 03/03/2020 12:23 PM 550 5.7.1 This message is rejected by our SPAM filters. Please refer https://support.mailhostbox.com/email-administrators-guide-error-codes/ for more information ‘*********@********’ on 03/03/2020 12:23 PM 550 5.7.1 This message is rejected by our SPAM filters. Please refer https://support.mailhostbox.com/email-administrators-guide-error-codes/ for more information
Hello Christianah, Thank you for your comment. Unfortunately, it appears that your email messages are being flagged as spam by the recipient server and cannot be delivered. One of the reasons for this may be that you do not have DMARC records configured for your domain name. I recommend ensuring that you have configured the DMARC records for that domain as per the instructions on the following guide: https://www.inmotionhosting.com/support/edu/cpanel/dmarc-setup/ If you are still receiving this error after setting up DMARC records, I recommend contacting our 24/7 Technical Support team by submitting a ticket through AMP, calling 757-416-6575, or by starting a chat session. Best Regards, Alyssa K.
i need to know what type of error is this….. Error: “552 5.2.0 ESMTP server not available AUP#I-1340″…
I always get a success on $mail->Send() using the code above. For a valid TO email address, I get the email and everything is fine. However, how do I view the logs to find out why an email send failed? For instance, if I specify an AddAddress of [email protected], it still says “Message has been sent” … I need a way to find out if the email was actually rejected. Where is that log located on the InMotion server? Thx!
Hi, i’m currently found error code like Error: “452 4.1.0 ESMTP server temporarily unavailable AUP#I-1370” may i know why this error repeating in my server how to avoid this problem
This error appears to indicate that there is a disruption in the ability to connect to the server, however, only temporarily. If this is repeatedly occurring, I recommend reviewing your email/website activity to ensure you are not overutilizing server resources.
i got this error code [SMTP protocol failure: syntax error: 3-digit code not found; ] simentanuosly durring mailling what kind of error this is and how can i rectify this error
If you do not have an error code you will need to contact your hosting provider so they can review the mail server logs to see whats going on.
Each of the following recipients was rejected by a remote mail server. The reasons given by the server are included to help you determine why each recipient was rejected. 554 dnvrco-cmimta15 esmtp ESMTP server not available AUP#I-1000 <dwills@***.rr.com> Please reply to <[email protected]> if you feel this message to be in error.
Since the error states “ESMTP server not available” this indicates a delivery failure. If you are seeing this message “from remote mail server after RCPT” then it is an issue with the recipient server. You can also review your mail logs to determine if the delivery is successful. If it was not delivered, the mail logs will provide additional clues into where in the transaction the failure is occurring. Thank you, John-Paul
good morning , my question is this ; by sending an email to the box [email protected] throws this mesaje ; ============================================================ = Greetings from the MDaemon mail system at rivacons.com = ============================================================ The following message: Session-ID: 923018 (specific to this delivery attempt) Queue-ID: pd50002228004.msg Message-ID: [email protected] could not be delivered to the following recipient(s): [email protected] (unrecoverable error) despite one or more unsuccessful attempts to do so. No further delivery attempts will be made and the message has been removed from the queue. The original message headers follow at the end of this report. For information on DSN messages see https://www.altn.com/dsn/. Please quote the Queue-ID, Session-ID, and Message-ID found above in any inquiries regarding this message. ======================== = Session Transcript = ======================== Session 923018; child 0002 Parsing message <xxxxxxxxxxxxxxxxxx\pd50002228004.msg> * From: xxx@xxx.com.ar * To: xxx@infovia.com.ar * Subject: test * Size (bytes): 1277 * Message-ID: <[email protected]> Resolving MX record for infovia.com.ar (DNS Server: 200.69.193.1)… * P=010 S=000 D=infovia.com.ar TTL=(1282) MX=[vmx.terra.com] Attempting SMTP connection to vmx.terra.com Resolving A record for vmx.terra.com (DNS Server: 200.69.193.1)… * D=vmx.terra.com TTL=(53) A=[208.84.244.136] Attempting SMTP connection to 208.84.244.136:25 Waiting for socket connection… * Connection established 201.216.238.83:1873 –> 208.84.244.136:25 Waiting for protocol to start… <– 554 mail-cmgw01-mia.tpn.terra.com cmsmtp ESMTP server not available –> QUIT ======================== = End Transcript = ======================== can you help me with this problem please? greetings from Argentina.
Hello Cristian, I took a close look at the top-level-domain used for the email address (infovia.com.ar). When I ran a WHOIS , traceroute, or ping, it would not recognize the domain. I even checked at the ICANN (https://whois.icann.org/en/lookup?name=infovia.com.ar) site and it’s not recognized. So, in terms of the issues email delivery, I would start with the domain name first. If you have any further questions, please let us know. Kindest regards, Arnel C.
Hello himanshu, Thank you for contacting us. Yes, creating SPF records with PTR can often help your email get delivered. But keep in mind there are many reasons email may not be delivered, so it must be handled on a case-by-case basis. Reveiwing your servers mail logs is the best method for troubleshooting most email issues. Thank you, John-Paul
Hi My name is himanshu. please suggest me , my lan users are not able to send the mail,it shows in outbox, error says check with your ISP But Lan users are able to send mails when i am changing the LAN public ip
Hello Himanshu, Sorry for the problem with your outbound mail. If you are maintaining the IP address and email server for your installation, then I would highly recommend reviewing the bounce messages when your emails fail. These bounce- messages will give you the specific information you require to see WHY an emails. If it is failing due to a blacklist, then it will be indicated in the bounce along with the information on who to contact in order to be de-listed. This is what appears to be happening based on the fact that you’re changing public IP addresses and then your mail starts working again. Please check out our article: Why do email servers get blacklisted. I hope this helps to answer your question, please let us know if you require any further assistance. Regards, Arnel C.
One of my clients experiencing the same issue, was trying to send out an email to 130 recipients. is there a way of resolving this, maybe increase the limit?
Hello Mildred, Our shared servers are hard set to only allow 50 recipients per email. This is not a setting that can be changed at the account level. Kindest Regards, Scott M
Looking for some help with Server error: ‘452 too many recipients’. the list above says this is an system storage issue. I was able to send to the list before. Suggestion help.. thanks in advance
Hello Rich, How many emails are you trying to send out at one time? Most servers have hard limits, ours are set to 50. Best Regards, TJ Edens
site 2 weeks I cann’t send with smtp service of yahoo, error 200 “unknow error certificate bad; destination host name does not match in certificate, even if I use different PC
Hello Grillo, If you are one of our customers you will want to contact Live Support for account specific help. Kindest Regards, Scott M
Hello Swetha, 404 is not an SMTP error but a server error when it cannot find a page. Are you getting this error when trying to log in? If so, what is the URL you are trying to log into? Kindest Regards, Scott M
