Can you try to see if you can connect to the port 25 of remote mail server from the server itself ?
dig mx domain.com (the domain name is the domain of email account failing ) to get the mail servers. Then try telnet to the mail server to see if you can connect from the server. If no , some firewall block either at your server , or at the remote server is causing the problem.
dig mx domain.com (the domain name is the domain of email account failing ) to get the mail servers. Then try telnet to the mail server to see if you can connect from the server. If no , some firewall block either at your server , or at the remote server is causing the problem.
Hello 
You can search for this message in your email queue and attempt delivery to see if there are any specific error messages that are preventing the email from sending to the remote mail server.
Thank you.
You can search for this message in your email queue and attempt delivery to see if there are any specific error messages that are preventing the email from sending to the remote mail server.
Thank you.
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