Now I understand. This is pretty simple to fix. Check this site: http://www.freebsd.org/doc/en/books/handbook/mail-trouble.html#Q28.5.4. or http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch21_:_Configuring_Linux_Mail_Servers#The_.2Fetc.2Fmail.2Frelay-domains_File
Jeremiah E. Bess Network Ninja, Penguin Geek, Father of four On Sun, May 31, 2009 at 02:11, Jibz <[email protected]> wrote: > the exchange server is not the relay..... my problem is that only the > mails sent from the exchange server is getting bounced. My Server is CentOS > and i'm using sendmail. I see this error in my linux server logs. > > So my question is that can i do something on my linux server to allow mails > from the exchange server without checking for any rules???? > > > On Sun, May 31, 2009 at 9:25 AM, Jeremiah Bess <[email protected]>wrote: > >> I'm not an exchange guy, so I can't help much in that area. Is there any >> reason why you have to use the exchange server as a relay? >> >> Jeremiah E. Bess >> Network Ninja, Penguin Geek, Father of four >> >> >> On Sat, May 30, 2009 at 21:28, Jibz <[email protected]> wrote: >> >>> Is there any way i can tell my mail server to not to deny that IP? Can i >>> change the configuration not to check for relay? >>> >>> On Sun, May 31, 2009 at 2:48 AM, Jeremiah Bess >>> <[email protected]>wrote: >>> >>>> This is because your internet address does not reverse map to the DNS >>>> domain you are sending from. You need to set your external DNS to use your >>>> NATed address, or use a dynamic DNS hosting service like dnydns or >>>> no-ip.com. >>>> >>>> Basically, when you go to iptools.com and do a MX lookup for >>>> yourdomain.com, it should show the internet address of your ISP modem. >>>> Additionally, your IP should reverse map to yourdomain.com. >>>> >>>> Jeremiah E. Bess >>>> Network Ninja, Penguin Geek, Father of four >>>> >>>> >>>> >>>> On Sat, May 30, 2009 at 12:10, Jibz <[email protected]> wrote: >>>> >>>>> I have setup a mail server on CentOS 5 >>>>> >>>>> >>>>> sendmail-8.13 >>>>> >>>>> I'm able to sent and receive mails from yahoo and gmail. >>>>> I've another microsoft exchange server on the same network. Mails sent >>>>> from that server to my mail server gets bounced. >>>>> >>>>> I got this error in /var/log/mail >>>>> >>>>> *May 30 22:11:24 myhostname sendmail[31981]: n4UGfO5L031981: >>>>> ruleset=check_rcpt, arg1=<[email protected]>, relay= >>>>> mx1.exchangeserver.com[public IP of exchange server] (may be forged), >>>>> reject=550 5.7.1 <[email protected]>... Relaying denied. IP name >>>>> possibly forged [public IP of exchange server] >>>>> >>>>> May 30 22:11:24 myhostname sendmail[31981]: n4UGfO5L031981: >>>>> from=<usern...@exchangeserver>, size=0, class=0, nrcpts=0, proto=SMTP, >>>>> daemon=MTA, relay=mx1.exchangeserver.com [public IP of exchange >>>>> server] (may be forged)* >>>>> >>>>> As the exchange server is in my network if you do a lookup for the >>>>> domain name of that server you will get the local IP only. >>>>> >>>>> So i changed the entry of my /etc/hosts file >>>>> >>>>> and added >>>>> >>>>> <PUBLIC IP> <exchangeserver.com> >>>>> >>>>> Now still the mails bounces but a different error >>>>> >>>>> *May 30 22:42:10 myhostname sendmail[32645]: n4UHCASl032645: >>>>> ruleset=check_rcpt, arg1=<[email protected]>, >>>>> relay=mail.exchangeserverom [public IP of exchange server], reject=550 >>>>> 5.7.1 >>>>> <[email protected]>... Relaying denied >>>>> >>>>> >>>>> May 30 22:42:10 myhostname sendmail[32645]: n4UHCASl032645: >>>>> from=<usern...@exchangeserver>, size=0, class=0, nrcpts=0, proto=SMTP, >>>>> daemon=MTA, relay=mail.exchangeserver[public IP of exchange server]* >>>>> >>>>> Please help me out!!!! >>>>> >>>>> >>>>> >>>>> >>>> >>>> >>>> >>> >>> >>> -- >>> "The will of God will never take you where the Grace of God will not >>> protect you." >>> >>> >>> >>> >> >> >> > > > -- > "The will of God will never take you where the Grace of God will not > protect you." > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Linux Users Group. To post a message, send email to [email protected] To unsubscribe, send email to [email protected] For more options, visit our group at http://groups.google.com/group/linuxusersgroup -~----------~----~----~----~------~----~------~--~---
