greetings!

I think this is the right fourm if not move as needed.

I'm running a sendmail IMAP configuration on a RH9 box. I have a client in california who uses our email services (IP restricted) as well sans the SMTP relaying (they use their own ISP for that.) The issue i'm running into is that while my client tries to send mail out (while keeping our domain name to keep it seamless) it rejects the email because they are using our domain name as the alias and sending from her ISP. I'm guessing that RDNS won't allow it through a spam filter thinking that it's a spammer.

I'm trying to gather my options on how to solve the issue and what i can come up with is that A) I allow the client to relay through our server to keep consistency B) she loses the seamlessness and just does the relay with her ISP.

These seem to be the only options i can think of, I have not been able to find anyone with a similar issue. That's what brought me here. I know i may not be explaining this the best, so please ask for more information if i need to provide it.

Those running the smtp server that's rejecting the mail are either ignorant, or they're slimey bastards who don't mind blocking legit mail to block spam. The solution-- tell the recipient that their mail server is malconfigured, and ask them to provide an email address that works. I wouldn't bend over for them. They're blocking email that is rfc822 compliant, and have no authority to force their preferred (more rigid) standards on others at the cost of convenience.

Your client could route mail through your mailserver, but I don't recommend offering that service just to support the poorly conceived philosophies of the recipient. The recipient is the one with the problem, not you or your client.

And let me guess, the end recipient has one of these ISPs: Comcast, Road Runner, Mindspring, AOL, or Earthlink.. these ISPs should be boycotted. I sued Comcast over their failure to control their overzealous spam blockers which were blocking my legit email. Don't let them get away with it.