SMTP Error Messages

SMTP Response Codes and Errors

Simple Mail Transfer Protocol (SMTP) is an internet standard for email transmission.
SMTP is a text based protocol in which the sender communicates with the mail receiver by issuing comands and receiving a response code.

 

Sample:

C: MAIL FROM:<someone@arclab.com>
S: 250 Ok

In this sample the client issues the MAIL FROM command and the server replies with 250 Ok.

 

The following list of response codes and error messages should help you to find errors in your settings.

 

211 System status, or system help reply

 

214 Help message

 

220 <domain> Service ready

 

SMTP Error 221

221 <domain> Service closing transmission channel
221 Closing transmission
221 Goodbye

 

221 is an authentication error. This means you are using the wrong mail server, the user/password is incorrect or you need to change the authentication method.
See: Troubleshoot - Problems with outgoing Messages

 

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

 

SMTP Error 451

451 Requested action aborted: local error in processing
451 You have exceeded your messaging limits

 

The program cannot send more messages, because your mail account / mail server has a limitation.
Please contact your mail administrator or mail provider regarding this issue.

Please note, that the program cannot send out more messages as your mail server allows. Some mail server have limits, e.g. some allow to send only x messages per hour. You can use the List Settings -> Outgoing Mail Server (SMTP) -> Limit feature to adjust the program to any limit.

If you have setup a limit in the List Settings -> Outgoing Mail Server (SMTP) then the task (mailing) will stop, the task will be re-scheduled and will continue automatically after the specified delay

 

452 Requested action not taken: insufficient system storage

 

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

 

SMTP Error 550

550 Requested action not taken: mailbox unavailable [E.g., mailbox not found, no access]
550 5.7.1 unable to relay for

 

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. You will also get this error if you have selected an invalid authentication method. See: Troubleshoot - Problems with outgoing Messages

 

551 User not local; please try <forward-path>

 

552 Requested mail action aborted: exceeded storage allocation

 

SMTP Error 553

553 Requested action not taken: mailbox name not allowed (e.g. mailbox syntax incorrect)
553 Sorry, over your daily relay limit

 

The program cannot send more messages, because your mail account / mail server has a limitation.
Please contact your mail administrator or mail provider regarding this issue.

Please note, that the program cannot send more messages as your mail server allows. Some mail server have limits, e.g. some allow to send only x messages per hour. You can use the List Settings -> Outgoing Messages (SMTP) -> Limit feature to adjust the program to any limit.

If you have setup a limit in the List Settings -> Outgoing Mail Server (SMTP) then the task (mailing) will stop, the task will be re-scheduled and will continue automatically after the specified delay.

 

554 Transaction failed