Look at the end. -----Original Message----- From: redhat-list-bounces@xxxxxxxxxx [mailto:redhat-list-bounces@xxxxxxxxxx] On Behalf Of Greg_Wilson@xxxxxxxxxxxxxxxxx Sent: Monday, August 30, 2010 4:20 PM To: General Red Hat Linux discussion list Subject: RE: Subject: sendmail domain configuration as Message 9 MASQUERADE_AS(`my_domain.net')dnl Greg Wilson Information Technology Specialist Systems Deployment and Support Division From: "Allen, Jack" <Jack.Allen@xxxxxxxxxxxx> To: General Red Hat Linux discussion list <redhat-list@xxxxxxxxxx> Date: 08/30/2010 11:59 AM Subject: RE: Subject: sendmail domain configuration as Message 9 Sent by: redhat-list-bounces@xxxxxxxxxx -----Original Message----- From: redhat-list-bounces@xxxxxxxxxx [mailto:redhat-list-bounces@xxxxxxxxxx ] On Behalf Of John Wong Sent: Sunday, August 29, 2010 3:11 AM To: redhat-list@xxxxxxxxxx Cc: j w Subject: Re: Subject: sendmail domain configuration as Message 9 Hi Allen, I believe you need to ask your ISP to add a DNS MX record for system.house.network. Why don't you just change house.network to one of your registered domain? The reason it work is because BigDaddy.com created DNS MX records for those domains. Hope it will help. jw ------------------------------ Message: 9 Date: Thu, 26 Aug 2010 19:01:16 -0400 From: "Allen, Jack" <Jack.Allen@xxxxxxxxxxxx> To: General Red Hat Linux discussion list <redhat-list@xxxxxxxxxx> Subject: sendmail domain configuration Message-ID: <230ED15F81AFD3409345FFA4E565F0E50D2B4FB1@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx> Content-Type: text/plain; charset="us-ascii" Hello: I need to know exactly what options need to be specified in sendmail.mc to generate the proper sendmail.cf file so the domain name my ISP sees is valid. Here is some information why this is needed. I have 2 Windows PC and 1 Linux systems and several Home Automation, NAS, Media systems on a home network. I have named running on the Linux system for a local fictional domain called "house.network". I know network is longer than the normal 3 character .com, .net, ..., but it works with no problems as far as name lookup and what have you. I also chose the longer name so there would be no conflict with a real domain name out in the real world and thing on my local network would not get routed to it. I have some of the special systems send email to the Linux system which then has aliases to send certain emails to my ISP email and/or my work email. This is where the problem starts. If the Linux host name is set to system. house.network, then when it connects to the ISP I get error 550 Invalid sender domain. This is because the domain cannot be looked up by the ISP and I can understand why. If I set the Linux host name to system.my_domain.net it works like it should. I registered 2 real domain names (my_domain.com and my_domain.net) with BigDaddy.com partly for this. But when the Linux host name is not in the same domain as the other systems on my local network it cause some other problem. If I add the option in sendmail.mc to generate a sendmail.cf file with Djmy_domain.net and have the Linux host name set to system.house.network the ISP complains with basically the same 550 error. Looking at the returned email some of the header information looks like: Reporting-MTA: dns; my_domain.net Received-From-MTA: DNS; system.house.network Which indicates to me the value of the host name is what my ISP sees that it tries to validate. I have looked at and tried various configurations for masquerading, but have the same problem. It seems to rewrite certain header entries that basically the user's client software look at to display from and to and what have you, but does not change the Received-From-MTA entry. So I hope someone has some good suggestions to help me resolve this problem. ----- Jack Allen ============ Thanks for the reply, but my ISP is NOT going to add anything to their DNS for my system. I am just one hundreds of thousands that get a dynamic IP address from them. The point of my question is to find suggestions on how to configure sendmail to work with an ISP that is not going to change anything, but validates the systems that connects to them to relay email. This is done to eliminate SPAMER. ----- Jack Allen ========= Thanks for the reply. I have already tried that and it does not work. When my system connects to the Comcast email server is tells it it's real name and the masqueraded name. Comcast tries to look up the real name which it cannot find and then refuses to relay the email. It returns the email stating it is an invalid domain. ----- Jack Allen -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
