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I have a couple CGI scripts that send confirmation emails using sendmail. overnight, the messages stopped sending. They seem to be stuck in the /var/spool/clientmqueue directory. I haven't changed any settings and cannot figure out the problem. I did try to send an email from a shell prompt and that didn't work either.
My internet connection seems to be up, as I can access the web server (apache). I can ftp and ssh. nslookups work so I believe my DNS is functional.
You can actually contact the people that do the blacklisting and request they remove you. I haven't needed to do that (knock on wood) but I know it can be done. A Google search will likely tell you who to contact.
Prior to doing that though you'd want to make sure you had fixed whatever let the spammer use you or they'll do it again. I'm sure there's some threshold at which the blacklisting folks will quit removing you. Also contacting those people only removes you from their spam lists. If any organization does their own blacklist instead of subscribing to the common ones you'd have to contact them. That would only be necessary if you found it was someone to whom you need to send email. There'd be no reason to bother if it was just someone the spammer had hit using your server.
Thank you for that link. It will help in the future.
My problem has been solved. How? I don't know. There where no errors in the maillong just messages going into the queue. I could access the smtp domain through telnet using the ip address, but would get name resolution failures when trying to use the domain name.
In short, I believe my ISP was having DNS issues, but if they weren't I have no idea how the problem was solved. Thanks for the help.