[IMail Forum] Still getting bounced mail

[Todd - Smart Mail]

We are still getting email sent from our servers bounced back.  The IMail log shows -   07:03 07:42 SMTP-(000006D8) >MAIL FROM:<mai[EMAIL PROTECTED]> 07:03 07:42 SMTP-(000006D8) 553 5.1.8 <mai[EMAIL PROTECTED]>... Domain of sender address mai[EMAIL PROTECTED] does not exist 07:03 07:42 SMTP-(000006D8) ERR undeliverable 553 5.1.8 <mai[EMAIL PROTECTED]>... Domain of sender address mai[EMAIL PROTECTED] does not exist 07:03 07:42 SMTP-(000006D8) SMTP_DELIV_FAILED 07:03 07:42 SMTP-(000006D8) >QUIT     My understanding is that its DNS issue.  The remote server cannot locate/resolve the domain and so it thinks that it does not exist.    The bounces are coming exclusively from domains that have Sendmail 8.xx servers.    I spoke with an email admin two days ago that was good enough to reboot his DNS servers.  After he did that we were able to send to his domain without problems for a while,  now we are getting bounces again. .   We are having this problem with many larger companies, reliant.com, pbsolar.com, netzero.com to name a few.    Help is Greatly Appreciated.       Todd Hunter Progressive Systems