We have an issue with our client. When sending emails out, we are able to send to some of the domains and some not. For example, when we send to hotmail.com, it goes out fine but when we send to yahoo.com, yahoo.com.au or yahoo.fr or yahoo.ie, it just stays in the Queue and do not go out. Tried to force the connection but still no luck.
In additional information it says SMTP connection error. Can anyone help.