553 validating sender
Domain propagation is the process where Internet Service Providers (ISPs) around the world automatically update their records (DNS tables) to reflect the new domain or to reflect a change in the hosting provider for the domain name. We suggest the following: Solution A: Please ensure that the SMTP port number is set to 25 and that the option “My outgoing server(SMTP) requires authentication” is selected.
Once the changes have been made, the domain’s website and email services will be activated. But if the problem persists, then deselect “My outgoing server(SMTP) requires authentication”.
Please note that full domain propagation can take between 24-72 hours. If this still does not resolve the problem, proceed to Solution B.
To verify when your domain was last updated, we suggest that you conduct a whois on your domain. Solution B: For SMTP port number setting, use port 587 instead and “de-select” the option “My outgoing server requires authentication”.
The destination system specified in the address does not exist or is incapable of accepting mail.
For Internet mail names, this means the address portion to the right of the "@" is invalid for mail. The mailbox address as specified matches one or more recipients on the destination system.
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.Microsoft Outlook Express and Outlook 20001.) Click Tools2.) Click Accounts3.) Click the Mail tab4.) Double-click on the Blue Tie account5.) Verify that the email address is entered in all lowercase letters (General Tab)6.) Click the Servers tab.7.) Verify that “Server Requires Authentication” is checked8.) Click the Settings button and verify that “Login using same settings as my incoming mail server” is selected9.) Click ‘Apply’ (if available), then ‘OK’, and then ‘Close’.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.The general semantics implies that the recipient can delete messages to make more space available.This code should be used as a persistent transient failure.What does a “Reason: 553 sorry, that domain isn’t in my list of allowed rcpthosts (#5.7.1)” error mean when an email message bounces back to the sender?