Description: Syntax error in parameters or arguments. What does this mean? This is similar to SMTP Error #500, although this is specific to the additional ‘parameters’ or options that are being used. How to fix SMTP Error 501? This is most commonly an issued with an incorrect/invalid email address, however can also be due to […]

Description: Command not implemented. What does this mean? The parameters or options being used when sending mail from your local server are recognized, however disabled in it’s configuration. How to fix SMTP Error 502? Diagnose the exact parameters being used for sending the email message(s) when the error occurred. Review your MTA’s configuration to attempt […]

Description: Recipients Exchange Server incoming mail queue stopped. What does this mean? Like almost all Microsoft Errors, the description doesn’t give you much. It’s typically due to a connection problem, however the only way to confirm the issue will be to contact the server administrators. How to fix SMTP Error 432? Unfortunately, with out knowing […]

Description: Recipients mail server is not responding What does this mean? This error isn’t as specific as hoped, however it does confirm the issue is not regarding your server (or outgoing mail server). The issue is specifically regarding the recipient’s incoming mail server. How to fix SMTP Error 441? Knowing that the issue is on […]

Description: Connection dropped during transmission. What does this mean? Everything was processing successfully, with no errors reported from the recipient server, until an abrupt connection issue. This is almost always related to networking misconfiguration or downtime. How to fix SMTP Error 442? Check your computer’s local internet connection, after confirming no local network issues exist, […]

Description: The maximum hop count was exceeded for the message: an internal loop has occurred. What does this mean? Your mail server was unable to determine where to send the email. This can be caused by numerous redirects and different intermediate mail exchanges. How to fix SMTP Error 446? Contact your SMTP or Mail Exchange […]

Description: Your outgoing message timed out because of issues concerning the incoming server. What does this mean? Your mail server was not able to process the entire list of email recipients intended for the message. Some configurations have a recipient maximum that will cause this error. How to fix SMTP Error 447? Reduce the number […]

Description: Timeout connection problem. What does this mean? This error has been provided by a GroupWise server, only the server administrators of the receiving mail server will be able to confirm the actual issue present. However, this is typically as a result of being blocked by the recipient’s firewall/filter or the server is experience a […]

Description: Service not available, closing transmission channel. What does this mean? This is an unfortunately, open ended error. Most commonly this is in relation to the destination server not being “reachable”, however it may also mean that your sending mail server is not “reachable”. The latter of the two options is less common, unless a […]

Description: Not enough storage or out of memory. What does this mean? The actual message may seem a little misleading. This is not in relation to the receiving/destination server running out of memory or not having enough storage for delivery. This is actually in regards to the amount of recipients the email message has. Suggesting […]