Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.os.linux.networking > #489

Re: Can I by-pass my ISP to email?

Followups directed to: comp.os.linux.networking

Show all headers | View raw

Pascal Hambourg wrote:

> unruh a écrit :
>> On 2011-08-13, Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> wrote:
>>> Hello,
>>>
>>> Grant Edwards a ?crit :
>>>> Many/most e-mail servers will ignore mail sent [...]
>>>> from IP addresses that don't belong to machines pointed to
>>>> by MX records,
>>> How do you know that somewhere in the DNS space there is an MX record
>>> which points to a host name which points to a given IP address ?
>> 
>> nslookup
>> set type=mx
>> host.name.ca
>> 
>> (or whatever your email address is)
> 
> What does my e-mail address have to do with the above statement ?
> I rephrase :
> A host connects to some mail server from IP address a.b.c.d.
> How does the mail server know that IP address a.b.c.d is pointed to by
> an MX record ?

Slight terminology thing here. I don't care about MX records. My system is 
configured to reject mail from anything without a reverse DNS. It's pretty 
good, although there has been the odd occasion when a genuine sender got 
rejected because of a DNS issue. However, many dynamic allocations do have 
reverse DNS associated with them, usually in the form of <mangled-IP-
address>.isp, so other checks are required.

-- 
Dave
da ve@llondel.org (without the space)
So many gadgets, so little time.

Back to comp.os.linux.networking | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Can I by-pass my ISP to email? "NoHtmlMailsPlease" <UsePlainText@dog.edu> - 2011-08-11 20:54 +0200
  Re: Can I by-pass my ISP to email? "Dave {Reply Address In.Sig}" <noone$$@llondel.org> - 2011-08-13 15:03 +0100
    Re: Can I by-pass my ISP to email? "NoHtmlMailsPlease" <UsePlainText@dog.edu> - 2011-08-14 08:45 +0200
      Re: Can I by-pass my ISP to email? Chris Davies <chris-usenet@roaima.co.uk> - 2011-08-14 13:49 +0100
      Re: Can I by-pass my ISP to email? "Dave {Reply Address In.Sig}" <noone$$@llondel.org> - 2011-08-14 16:19 +0100
        Re: Can I by-pass my ISP to email? unruh <unruh@wormhole.physics.ubc.ca> - 2011-08-15 02:38 +0000
  Re: Can I by-pass my ISP to email? Peter Köhlmann <peter-koehlmann@t-online.de> - 2011-08-13 16:17 +0200
  Re: Can I by-pass my ISP to email? Grant Edwards <invalid@invalid.invalid> - 2011-08-13 15:30 +0000
    Re: Can I by-pass my ISP to email? Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2011-08-13 19:31 +0200
      Re: Can I by-pass my ISP to email? unruh <unruh@wormhole.physics.ubc.ca> - 2011-08-14 11:44 +0000
        Re: Can I by-pass my ISP to email? Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2011-08-14 16:07 +0200
          Re: Can I by-pass my ISP to email? "Dave {Reply Address In.Sig}" <noone$$@llondel.org> - 2011-08-14 16:14 +0100
          Re: Can I by-pass my ISP to email? unruh <unruh@wormhole.physics.ubc.ca> - 2011-08-15 02:35 +0000
            Re: Can I by-pass my ISP to email? Richard Kettlewell <rjk@greenend.org.uk> - 2011-08-15 08:59 +0100
              Re: Can I by-pass my ISP to email? unruh <unruh@wormhole.physics.ubc.ca> - 2011-08-15 13:28 +0000
                Re: Can I by-pass my ISP to email? Richard Kettlewell <rjk@greenend.org.uk> - 2011-08-15 15:24 +0100
              Re: Can I by-pass my ISP to email? Grant Edwards <invalid@invalid.invalid> - 2011-08-16 14:05 +0000
  Re: Can I by-pass my ISP to email? Stefan Schmiedl <s@xss.de> - 2011-08-13 19:30 +0200
    Re: Can I by-pass my ISP to email? "NoHtmlMailsPlease" <UsePlainText@dog.edu> - 2011-08-14 09:11 +0200
  Re: Can I by-pass my ISP to email? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-08-13 20:49 +0000
    Re: Can I by-pass my ISP to email? "NoHtmlMailsPlease" <UsePlainText@dog.edu> - 2011-08-14 09:52 +0200
  Re: Can I by-pass my ISP to email? unruh <unruh@wormhole.physics.ubc.ca> - 2011-08-14 11:41 +0000

csiph-web