[Gllug] virgin/ntl/telewest plonkers

[Alain Williams]

On Wed, Dec 16, 2009 at 08:56:14PM +0000, t.clarke wrote:
> There is, of course, no need to use your ISP to provide DNS service for your
> domain.  I believe there are providers who can do this for you regardless
> of who actually 'owns' your IP address.
> 
> For example, we have three separate ADSL circuits from completely different
> ISPs, but the domain name service is provided by just one of them.
> 
> 
> You don't actually need a reverse DNS entry for email to work.  However
> (from memory - so may recall this incorrectly) some mail-exchangers check
> for a reverse DNS entry (match it against your smtp 'helo' ?) and will reject
> your emails if no entry found.

Some will also look up your IP address, to get a name & then see if that name
resolves to the IP address ... at least exim will do so.

-- 
Alain Williams
Linux/GNU Consultant - Mail systems, Web sites, Networking, Programmer, IT Lecturer.
+44 (0) 787 668 0256  http://www.phcomp.co.uk/
Parliament Hill Computers Ltd. Registration Information: http://www.phcomp.co.uk/contact.php
Past chairman of UKUUG: http://www.ukuug.org/
#include <std_disclaimer.h>
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