ContributionsMost RecentMost LikesSolutionsRe: COX is not forwarding my mail 100% I have had the exact same issue -- some mail does not get forwarded, but from a few of my friends and my husband I am getting everything twice! This just started happening a few weeks ago after the changeover. Deb Re: 451 4.2.0 internal queueing error I feel so much better now. An error occurred while sending mail. The mail server responded: 4.2.0 Internal queueing error. Please check the message and try again. Re: 451 4.2.0 internal queueing error No solution here, but I've been getting the same error message -- although I'm using Firefox 50.1.0. As you say, when I try to resend after clearing the error message, the email sends just fine. Just started yesterday, but still happening randomly today. Re: Can't connect to Cox smtp server I'm experiencing a similar problem -- it has recurred off and on for the past two weeks. I get this error message: An error occurred sending mail: The mail server sent an incorrect greeting: eastrmimpo109 cox ESMTP server temporarly not available.