KNOWNHOST KNOWLEDGE BASE

Hosting Question? Find the Solution - Browse our Guides, Articles, and How-To's

SMTP Response 220

Category: Other
Tags: # # #

Description: <SERVER> Service ready. What does this mean? This is a general reply advising that the SMTP server is ready to proceed with the next command. There is not a “fix” for this SMTP Response code, at this point the SMTP server is ready to continue successfully. Related Articles: SMTP Response 252 SMTP Error 446 […]

SMTP Response 221

Category: Other
Tags: # # #

Description: <SERVER> Service closing transmission channel What does this mean? This response is stating the the session or connection to the mail server is now ending. Suggesting that all processes have completed, this could be successful or due to failures. SMTP Error 221 Examples There is not a “fix” for this SMTP Response code, as […]

SMTP Response 250

Category: Other
Tags: # # #

Description: Requested mail action okay, completed. What does this mean? Fantastic! Your email message was delivered, as expected. This is the polar opposite of an error. There is not a “fix” for this SMTP Response code, as it’s not specifically an error. Related Articles: SMTP Response 220 SMTP Error 432 SMTP Error 452 SMTP Error […]

SMTP Error 111

Category: Other
Tags: # # #

Description: Connection refused or inability to open an SMTP stream. What does this mean? This error is typically referencing a connection issue to the remove SMTP/Mail server. Often in relation to firewalls or misspelled domains. How to fix SMTP Error 111? As in most cases, you’ll want to ensure that the email address being sent […]

SMTP Error 211

Category: Other
Tags: # # #

Description: System status message or system help reply. What does this mean? This is a response from the server replying with system help information regarding to your query. There is not a “fix” for this SMTP Response code, as it’s not specifically an error. Related Articles: SMTP Error 101 SMTP Error 447 SMTP Error 501 […]

SMTP Error 214

Category: Other
Tags: # # #

Description: Help message (Information on non-standard command). What does this mean? This response should also contain information specific to your server. Most commonly also include a link/URL for a FAQ page. There is not a “fix” for this SMTP Response code, however the error may provide a link for more details. Related Articles: SMTP Response […]

SMTP Error 101

Category: Other
Tags: # # #

Description: Cannot open connection. What does this mean? Your email (SMTP) server is unable to start an SMTP session. Typical replies will be “SMTP Error 101, Error opening connection” or “SMTP Error 101, cannot open SMTP stream”. All SMTP Error 101 errors usually point to a configuration problem, such as an incorrectly spelled SMTP server, […]

SMTP Error 521

Category: Other
Tags: # # #

Description: <domain> does not accept mail (see rfc1846). What does this mean? The recipient mail server does not actually accept and deliver email itself. From this point, emails can either fail or be relayed/forwarded to another mail server. Most commonly, this is shown for relays. AOL Specific Reference If you received this error message in […]

SMTP Error 523

Category: Other
Tags: # # #

Description: The total size of your mailing exceeds the recipient server’s limits What does this mean? The recipient’s mail server does not accept emails with the used number of mass/multiple recipients. (Eg. Using 15 email addresses in the ‘TO:’ or ‘CC:’). How to fix SMTP Error 523? For whichever email address failed, send the email […]

SMTP Error 530

Category: Other
Tags: # # #

Description: Normally, an authentication problem. But sometimes it’s about the recipient’s server blacklisting yours, or an invalid email address. What does this mean? The specific error you receive should state the exact problem, but it may mean any of the following, Invalid authentication. (Wrong password). Blacklisted/Blocked IP Address. Invalid recipient email address. How to fix […]