thanks, that's something to consider, ideally once v5 out
a quick and dirty fix appears to be comment out the return line 99 in smtp.php
public function connect( $checkSsl=TRUE )
{
/* Do we already have a connection? */
if( array_key_exists( $this->connectionKey, static::$smtp ) )
{
///nov2024 return;
}
once done a 6k newsletter sent without error and the edit sort of validates this statement
Reset SMTP connections: Your suggestion to reset the SMTP connection before retrying to send a message that received this specific error is excellent. This will start a new session and should allow you to continue sending. It's a good practice to reset the connection after receiving this error, and it may indeed be beneficial to do so for other 4xx errors as well.
@Marc maybe another forum be better suited