Sendmail and DNS reverse lookup.

[Marie Eldridge_1]

I'm having a problem with some ISP's receiving mail,doing a reverse lookup on DNS for verfication and rejecting the message. The machine I am using for sendmail is internal only and not an outside address and will not be put in the DNS table for verification. Does anyone know of a way to get around this problem. I do have a known machine in the DNS table I could use if I knew how to forward mail to that machine and then have that machine send the messages. Any suggestions appreciated. Thanks.

[Kevin Wright · Accepted solution]

This is becoming a bigger problem lately with all the spam rules, an easy way to do this is to masquerade your machine to a public dns name. if your domain is domain.com, and your box is box.domain.com, set the DM macro to domain.com, and all mail from this box will come from user@domain.com..
You may exclude users from this masquerade, like root, by setting the CE macro to root.

[Marie Eldridge_1]

Thanks for the info. I understand the need for the ISP's doing this, but it makes life so much harder to do your real work.