Mostly is an authentication problem. However, sometimes it may just be the recipient server blacklisting yours or it is just an invalid email address. Causes Invalid authentication, for instances, wrong password Blacklisted or Blocked IP Address Invalid recipient email address Fixes Step 1: Email Address Correct Ensure the email address…
The total size of your mailing exceeds the recipient server limits. Causes Recipient mail server does not acknowledge email with the used number of mass or multiple recipients. For example, using 20 email address in the column of “TO” or “CC” Fixes Step 1: Send Them Separately For those email…
It does not accept mail. The recipient mail server does not actually accept and deliver email itself. Therefore, emails can be fail or being relayed. Causes Indicates a configuration error on the part of the recipient organization. For instance, incoming email traffic is being routed through a mail server which…
Address type is incorrect. Causes Possibly misspelled the address Related to authenticate issues Fixes Step 1: Ensure Email Address valid Check for email address misspellings. Step 2: Email Address Exist Make sure that the email address that you want to send the mail is still exist. Step 3: Authentication If…
A DNS error, the host server for the recipient domain name cannot be found Causes Normally due to misspelling of the domain name part of a recipient email address. If email address is correct, then it may be due to your mail server network configuration or conf Fixes Step 1:…
Bad email address Causes One of the email addresses in the column of “TO”, “CC”, “BCC” is entered incorrectly. Fixes Step 1: Ensure The Validity Of Email Address Check all email address and make sure it does not misspell.
Command parameter not implemented. Causes Syntax problem. Fixes Step 1: Contact NET For More Information It would same with error 502, you should contact NET for more information.
The server has meets the bad sequence of commands or it is require an authentication. Causes The parameters or options are being out of order from what the mail server expected Normally will see this when the email account has not yet been authenticated Fixes Step 1: Email Address Is…
Command not implemented. The parameters or alternatives being utilized when sending email from your local server are recognized, however it is disable in the configurations. Causes The command has not yet been activated on your own server. Typically, it is not supported in that particular server Fixes Step 1: Diagnose…
Another syntax error, but not in the command but is in its parameters or arguments. It is also similar to SMTP Error 500. Causes Due to an invalid email address Related to connection problems (issue concerning about your antivirus) Fixes Step 1: Manual Key In Email Address Manually key in…