Hello Folks, I’m having problems connecting to my SMTP server, where I’m able to receive email messages from other mail exchange, but I’m not able to send email messages to my SMTP server. The error message from my Outlook 2003 email browser reads: Task "Chief Administrator - Sending' reported error (0x80042109): 'Outlook is unable to connect to your outgoing (SMTP) e-mail server. If you continue to receive this message, contact your server administrator try Internet service provider (ISP) This true for all email - accounts, theirs only one actively used MX. I’ve checked the following systems / subsystems: 1.) client system firewall setting 2.) ISPConfig server firewall setting 3.) ISPConfig network port forward ( no block port obstructions ) 4.) Outlook Express 2003 email-account settings ( worked initially for a few days ) 5.) DNS settings, theirs none that I know of, all systems go ( preformed the # dig cmd, all is good ) 6.) Email account setting on target mail exchange ( email account exist, and ready for use; able to receive email messages via courier-pop without issues ) 7.) ISPConfig c panel indicates all systems are online and ready for use 8.) This is the ‘ # netstat -tap ‘ excerpt concerning SMTP, reads: ‘ tcp 0 0 *:smtp *:* LISTEN 23924/master’ 9.) ‘iptable -L’ excerpt concerning SMTP, reads: ‘PAROLE tcp -- anywhere anywhere tcp dpt:smpt Any information concerning my SMTP connectivity problem would be greatly appreciated, Thank you.