550 bounced check filter | The email address of one of the recipients is in stop list.
If more than one recipient is specified in the e-mail, repeat the sending for each of the recipients separately. If the address is in the local stop list, you can find and delete an address from the local stop list |
|---|
501 from domain not trusted | The domain from which the email is being sent has not been added to the list of allowed senders. Make sure that the correct connected the service for the domain |
|---|
421 SMTP command timeout — closing connection | The server closed the connection because it has not been used for more than 120 seconds. To clear the error, start the SMTP dialog again |
|---|
450 ratelimit exceeded | The speed limit of sending through the resource — 400 mails per 5 minutes for all domains of the resource — has been exceeded. Wait a few minutes and send again |
|---|