Success specifies that the DSN is reporting a positive delivery action. Detail sub-codes may provide notification of transformations required for delivery. A persistent transient failure is one in which the message as sent is valid, but persistence of some temporary condition has caused abandonment or delay of attempts to send the message.
If this code accompanies a delivery failure report, sending in the future may be successful. A permanent failure is one which is not likely to be resolved by resending the message in the current form.
Some change to the message or the destination must be made for successful delivery. The address status reports on the originator or destination address.
It may include address syntax or validity. These errors can generally be corrected by the sender and retried. Mailbox status indicates that something having to do with the mailbox has caused this DSN. Mailbox issues are assumed to be under the general control of the recipient. Mail system status indicates that something having to do with the destination system has caused this DSN.
System issues are assumed to be under the general control of the destination system administrator. The networking or routing codes report status about the delivery system itself. These system components include any necessary infrastructure such as directory and routing services. Network issues are assumed to be under the control of the destination or intermediate system administrator. The mail delivery protocol status codes report failures involving the message delivery protocol.
These failures include the full range of problems resulting from implementation errors or an unreliable connection. The message content or media status codes report failures involving the content of the message. These codes report failures due to translation, transcoding, or otherwise unsupported message media.The author voluntarily contributed this tutorial as a part of Pepipost Write to Contribute program. These response codes might be one of the five standard classes.
This is Success status which indicates that there is a positive response from the server which might have more information when the response has it respected subcodes 2XX X. X and response. This should be treated as a positive remark for delivery.
Since the status code response represents that the email address you are trying to reach is valid. If there is an issue with authentication this status code response is received from the server. This can be considered as a positive response because this status code response indicates recipient's MX as successfully received your email but has reverted with null response.
The email has been accepted for delivery but the delivery priority was changed. This is success status which indicates your email has been successfully delivered at recipient's end without any issue. This status code are temporary blockage for your emails delivery which should retry sending those emails automatically.
This blockage might be due to unusual traffic patterns from sending server IP address, emails having characteristics of spam or recipients MX is too busy accepting emails. This status code errors when user raises complaints for the emails which has been sent from our mail server. This status code errors when user raises complaints for the emails which has been sent from our mail servers on a shared IP. This status code indicates that high volume of mails has been sent from your IP.
Don't send email if you are receiving this status code check for email subscription list and make sure you are sending emails to user who as subsribed.
This status code response indicates your emails are postponed due to low connectivity percentage to MTA, Bad tokens within the message or unusal traffic of emails having PDF files in it.
Everything you need to know about SMTP Error Codes
Configuration issue at recipient's server. Something went wrong with protocol while delivering mail which can be well expressed with other status code. Something went wrong while validating authentication which can be expressed with other status code. Below is an simple example for sending email using telnet and you can check the response code after every command.
I have segregated the above example in below structure where you can easily understand the status code. Posted 5 months ago smtp.
Become an author. Status Codes Status code is differentiated into five categories as follows : 1xx returns informational code ie. Enhanced Status Codes Registry. Diving deep with extented code description 2xx detailed This is Success status which indicates that there is a positive response from the server which might have more information when the response has it respected subcodes 2XX X.Setting up video conferencing for remote work?
Set up Meet to help your team work remotely. If your inbound or outbound messages are bouncing back to their senders, inspect the bounced messages for SMTP reply codes generated by the message security service see below and apply the troubleshooting principles described below.
The example below shows an error message from a mail server. The code and status code is meant to be read by machines and the text message is meant for human consumption. The message tells us why the error occurred and what actions we can take to resolve the error.
The SMTP reply codes refer to specific to components of the service, and can indicate things like:. Although the error codes are primarily intended to be read by machines, it helps to understand what the codes and status-codes refer to when you are troubleshooting failed email transmissions.
All SMTP error messages follow this basic format with each digit in the error codes and status-codes denoting a different level of detail:.
Email transition error replies are all prefixed by either a 4 yz or a 5 yz code that denotes the type of error:. The third digit in the code gives a finer gradation of meaning in each category specified by the second digit.
The status codes provide additional information. Each digit in these codes carry their own precise meaning: the first digit denotes the code class, the second digit indicates the subject, and the third digit provides more detail. The last field contains a text string that describes the error in human readable text, unlike the codes, which are meant to be used by programs.
G Suite Admin Contact us. SMTP reply codes The SMTP reply codes refer to specific to components of the service, and can indicate things like: The intended recipient was not registered with the service The message was identified as spam or virus infected. Error code structure Although the error codes are primarily intended to be read by machines, it helps to understand what the codes and status-codes refer to when you are troubleshooting failed email transmissions.
All SMTP error messages follow this basic format with each digit in the error codes and status-codes denoting a different level of detail: Reply code Status code Reply text xyz x. Example"4. Was this helpful?
Yes No. Start your free day trial today Professional email, online storage, shared calendars, video meetings and more.In the blog post SMTP vs. IMAP vs. The client talks using commands that consist of alphabetical characters. The server responses with numerical codes. The client greets the server and introduces itself.
For some types of reporting messages like non-delivery notifications, the reverse-path may be void. Optional parameters may also be specified. With the DATA command, the client asks the server for permission to transfer the mail data. The response code grants permission, and the client launches the delivery of the email contents line by line. This includes the date, from header, subject line, to header, attachments, and body text.
The server responses to the final line. The NOOP command is used only to check whether the server can respond. With the HELP command, the client requests a list of commands the server supports. HELP may be used with an argument a specific command.
If the server supports this, it will provide the information accordingly to this request. VRFY is used to verify whether a mailbox in the argument exists on the local host. EXPN is used to verify whether a mailing list in the argument exists on the local host. The positive response will specify the membership of the recipients. Example: EXPN mail-list user1 client. Also, they are useful to perform an internal audit of the server.
On the other hand, these commands are considered a security risk. Spammers can use them to harvest valid email addresses from the server.
Therefore, messaging systems either install corresponding protections or disable the commands. It erases all the buffers and state tables both sender and recipient. RSET gets only the positive server response — At the same time, the SMTP connection remains open and is ready for a new mail transaction.
Once the server responses withthe client closes the SMTP connection. In the case of a negative responsethe client must decide whether to continue the SMTP session or not.Status codes are issued by a server in response to a client's request made to the server. The first digit of the status code specifies one of five standard classes of responses: 1xx Informational ; 2xx Successful ; 3xx Redirection ; 4xx Client Error or 5xx Server Error. All SMTP response status codes are separated into five classes or categories.
The first digit of the status code defines the class of response:. These return codes have been in SMTP from the beginning, with RFC inbut were extended rather extensively, and haphazardly so that by RFC rather grumpily noted that: " SMTP suffers some scars from history, most notably the unfortunate damage to the reply code extension mechanism by uncontrolled use.
This class of status codes indicates the action requested by the client was received, understood and accepted. In most cases when receiving a 4xx error the sending mail server will attempt to retry delivery after a delay, and may repeatedly do so for up to a day or two depending on configuration before reporting to their user that the mail could not be delivered.
These errors will result in the SMTP connection being dropped, and the sending mail server will advise the user that their mail could not be delivered. From Wikipedia, the free encyclopedia. Wikipedia list article. Retrieved December 20, Retrieved January 8, Error messages.
Abort, Retry, Fail? Spinning pinwheel Windows wait cursor. Categories : Hypertext Transfer Protocol status codes Internet-related lists. Hidden categories: Articles with short description Commons category link is locally defined Use mdy dates from November Pages using RFC magic links. Namespaces Article Talk.
The following incomplete list of response codes and error messages should help finding errors in your mail settings. It contains common problems and error messages. Note: SMTP access in disabled by default on some accounts, e.
Try again later. The SMTP error is normally used for temporary problems on the mail server or a problem with the recipients email account. Some mail providers might also return after you reached a limit restriction on your mail account see SMTP Error below.
If you receive one of the above or a similar error message from your mail server after you've sent out some messagesthen you have reached a limit on your mail server or email account.
This means your mail server will not accept any further messages until you waited some time. Note: No mail software can send more messages as your mail server or email account allows. It's a limitation of the used email account and not a program limit or software bug. Please contact your mail administrator or mail provider for further details on your account limits for SMTP mail outgoing messages.
If the used email account is too restrictive, use a different email account and mail server instead. It's recommended to use an email account from your own domain websiteyour company mail server or a business email account. In general a business account should have less mailing restrictions than a free account. You will get this error when you try to send an email to an invalid email address or if you need to authenticate before sending an email. Some providers also use error to indicate that you reached your send relay limit:.
Check the recipient's email address: either the email address does not exist or there is a syntax error. All other trademarks and brand names are the property of their respective owners. Email Marketing and Newsletters made easy SMTP Error 4.
Your mail account might have one or multiple limitations: Daily mail limit, e. Some providers also use error to indicate that you reached your send relay limit: 5. SMTP Error Requested action not taken: mailbox name not allowed Mailbox name invalid Check the recipient's email address: either the email address does not exist or there is a syntax error.
Disclaimer: The information on this page is provided "as is" without warranty of any kind. Further, Arclab Software does not warrant, guarantee, or make any representations regarding the use, or the results of use, in terms of correctness, accuracy, reliability, currentness, or otherwise.Don't have an account? Your data is transferred using secure TLS connections. This is a basic guide to the SMTP return or 'error' codes you may see for rejected or deferred messages in the Message Log of the Barracuda Email Security Gateway when an outbound message cannot be delivered to or accepted by the destination mail server.
Depending on the actual problem it encounters, the destination mail server that did not accept the message may not be able to provide detailed help on how to resolve a problem.
In this case the mail server may only provide an SMTP error code in the server's log, or in the text of the message returned to the sender. SMTP error codes you'll see in the Delivery Details field of the Message Details popup for a rejected or deferred message include the following, with more details listed in the table below:.
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List of All SMTP Commands and Response Codes
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SMTP Error Codes Last updated on This is a basic guide to the SMTP return or 'error' codes you may see for rejected or deferred messages in the Message Log of the Barracuda Email Security Gateway when an outbound message cannot be delivered to or accepted by the destination mail server.
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Send Email using SMTP in C#
This example shows error : SMTP error codes you'll see in the Delivery Details field of the Message Details popup for a rejected or deferred message include the following, with more details listed in the table below: - The message has been deferred due to suspect content.
Try again later. The server then gives a forwarding address to try. Last updated on