I am getting an error when trying to send an e-mail. There was a SMTP communication problem with the recipient's email server. Please contact your system administrator. <vpwex1.flexngate.local #5.5.0 smtp;550 Unable to resolve your ip address (216.8.160.19)>

Is there a publically accessible Reverse DNS record for 216.8.160.19?Typically your ISP needs to set that up.

Hi,I cannot telnet to that address on port 25, 110 answers with Exchange 2003 POP3 V6.5 but 25 does not respond.Check that port 25 is open and/or that that address is the correct address for the SMTP server.Miguel Fra / Falcon ITS Miguel Fra www.falconits.com

Thanks fo the help. We are checking into the issue with port 25. I will keep all inform of what we find out. Rick

Hi,Could you send the email by using the telnet command?http://support.microsoft.com/kb/153119From the error message, it seems that your email address is blocked by the security policy (reverse DNS). Thus, you need to try the telnet command in order to confirm the cause.If it is the reverse DNS issue, please set up the PTR record on the ISP.ThanksAllen