On 12/04/18 09:42, Mike Brudenell via Exim-users wrote:
> On 11 April 2018 at 19:43, Jeremy Harris via Exim-users <exim-users@exim.org
>> wrote:
> 
>> That would be incorrect per standards.  The HELO name should identify
>> the sending system.
>>
> 
> Umm… Agreed, but what if this mysterious and obfuscated organisation has
> multiple A records under different domain names pointing at the system Exim
> is running on? Wouldn't it then be valid to use any of those in the
> HELO/EHLO command? E.g.,
> 
>    - a.example.com is an A record pointing at ww.xx.yy.zz
>    - b.example.net is an A record pointing at ww.xx.yy.zz
> 
> Wouldn't it then be permissible to use a.example.com in the HELO/EHLO when
> sending from an "@a.example.com" address, but b.example.net when sending
> from an "@b.example.net" address?

Yes.  Because both cases identify the sending system.
-- 
Jeremy


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