Replace Private IP by Server Hostname in mail header
in [Postfix]
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From: Rachid Abdelkhalak on 27 Jun 2010 07:20 Hello List, I have a mail relay and an internal mail server both under Postfix and behind a firewall (DMZ and LAN), on both segment i'm using a private IP address with NAT. On all outgoing emails headers sent by our users, i can see my servers ip addresses (private). Is there any config that i can do to make postfix write hostname instead of the ip address on the header or replace the private ip address by the public ip address? Thank you Brest regards.
From: Jeroen Geilman on 27 Jun 2010 10:55 On 06/27/2010 01:20 PM, Rachid Abdelkhalak wrote: > > Hello List, > > I have a mail relay and an internal mail server both under Postfix and > behind a firewall (DMZ and LAN), on both segment i'm using a private > IP address with NAT. > > On all outgoing emails headers sent by our users, i can see my servers > ip addresses (private). > > Is there any config that i can do to make postfix write hostname > instead of the ip address on the header or replace the private ip > address by the public ip address? > > Thank you > > Brest regards. The format and content of Received: headers is described in detail in the relevant RFCs. Make sure you know why you want to mess with them before blundering forward. J.
From: Rachid Abdelkhalak on 28 Jun 2010 13:03 Thank you Jeroen, My need is to prvent peopel seeing my internal IPs, if i can make my server write on the header 127.0.0.1 instead instead of the 192.168.0.2 is will be great. I see on the header of your mail for example, all Received: tags indicate 127.0.0.1, i want my server to do the same thing if possible. Thank you -- |-Rachid Abdelkhalak |-Network Security Engineer, MTDS |-in morocco 080200MTDS |-direct +212(0)537278820 |-mobile +212(0)661173437 |-14, rue 16 novembre |-Rabat 10080 Kingdom of Morocco On Sun, 27 Jun 2010, Jeroen Geilman wrote: > On 06/27/2010 01:20 PM, Rachid Abdelkhalak wrote: >> >> Hello List, >> >> I have a mail relay and an internal mail server both under Postfix and >> behind a firewall (DMZ and LAN), on both segment i'm using a private IP >> address with NAT. >> >> On all outgoing emails headers sent by our users, i can see my servers ip >> addresses (private). >> >> Is there any config that i can do to make postfix write hostname instead of >> the ip address on the header or replace the private ip address by the >> public ip address? >> >> Thank you >> >> Brest regards. > > The format and content of Received: headers is described in detail in the > relevant RFCs. > > Make sure you know why you want to mess with them before blundering forward. > > J. > >
From: Jonathan Tripathy on 28 Jun 2010 13:04 Richid, Why is it a problem that people see your internal IPs? Thanks On 28/06/10 18:03, Rachid Abdelkhalak wrote: > > Thank you Jeroen, > > My need is to prvent peopel seeing my internal IPs, if i can make my > server write on the header 127.0.0.1 instead instead of the > 192.168.0.2 is will be great. > > I see on the header of your mail for example, all Received: tags > indicate 127.0.0.1, i want my server to do the same thing if possible. > > Thank you > > -- > |-Rachid Abdelkhalak > |-Network Security Engineer, MTDS > |-in morocco 080200MTDS > |-direct +212(0)537278820 > |-mobile +212(0)661173437 > |-14, rue 16 novembre > |-Rabat 10080 Kingdom of Morocco > > On Sun, 27 Jun 2010, Jeroen Geilman wrote: > >> On 06/27/2010 01:20 PM, Rachid Abdelkhalak wrote: >>> >>> Hello List, >>> >>> I have a mail relay and an internal mail server both under Postfix >>> and behind a firewall (DMZ and LAN), on both segment i'm using a >>> private IP address with NAT. >>> >>> On all outgoing emails headers sent by our users, i can see my >>> servers ip addresses (private). >>> >>> Is there any config that i can do to make postfix write hostname >>> instead of the ip address on the header or replace the private ip >>> address by the public ip address? >>> >>> Thank you >>> >>> Brest regards. >> >> The format and content of Received: headers is described in detail in >> the relevant RFCs. >> >> Make sure you know why you want to mess with them before blundering >> forward. >> >> J. >> >>
From: Rachid Abdelkhalak on 28 Jun 2010 13:07 This is not a problem for me, the end customer's IT boss asked me to see if it is possible to do it, he dont like to publish theire private IPs for 'Security reasons'. If it is not possible, i have to give him convincing arguments. Thank you -- |-Rachid Abdelkhalak |-Network Security Engineer, MTDS |-in morocco 080200MTDS |-direct +212(0)537278820 |-mobile +212(0)661173437 |-14, rue 16 novembre |-Rabat 10080 Kingdom of Morocco On Mon, 28 Jun 2010, Jonathan Tripathy wrote: > Richid, > > Why is it a problem that people see your internal IPs? > > Thanks > > On 28/06/10 18:03, Rachid Abdelkhalak wrote: >> >> Thank you Jeroen, >> >> My need is to prvent peopel seeing my internal IPs, if i can make my server >> write on the header 127.0.0.1 instead instead of the 192.168.0.2 is will be >> great. >> >> I see on the header of your mail for example, all Received: tags indicate >> 127.0.0.1, i want my server to do the same thing if possible. >> >> Thank you >> >> -- >> |-Rachid Abdelkhalak >> |-Network Security Engineer, MTDS >> |-in morocco 080200MTDS >> |-direct +212(0)537278820 >> |-mobile +212(0)661173437 >> |-14, rue 16 novembre >> |-Rabat 10080 Kingdom of Morocco >> >> On Sun, 27 Jun 2010, Jeroen Geilman wrote: >> >>> On 06/27/2010 01:20 PM, Rachid Abdelkhalak wrote: >>>> >>>> Hello List, >>>> >>>> I have a mail relay and an internal mail server both under Postfix and >>>> behind a firewall (DMZ and LAN), on both segment i'm using a private IP >>>> address with NAT. >>>> >>>> On all outgoing emails headers sent by our users, i can see my servers ip >>>> addresses (private). >>>> >>>> Is there any config that i can do to make postfix write hostname instead >>>> of the ip address on the header or replace the private ip address by the >>>> public ip address? >>>> >>>> Thank you >>>> >>>> Brest regards. >>> >>> The format and content of Received: headers is described in detail in the >>> relevant RFCs. >>> >>> Make sure you know why you want to mess with them before blundering >>> forward. >>> >>> J. >>> >>> >
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