Re: [exim] making my HELO = my RDNS

Anthony de Boer wrote:
> Stanislaw Halik wrote:
>
>> On Wed, Dec 06, 2006, Marc Perkel wrote:
>>
>>> Is there a simple way to set my HELO to be the same as my RDNS?
>>>
>> 1. Check your reverse DNS with lookup dnsdb
>> 2. Set it with helo_data in your remote smtp transport.
>> 3. ???
>> 4. Profit!
>>
>
> Fairly simple so long as the box has only one Internet-facing IP
> address and it has stable reverse DNS.
>
> At one point a few years back I had to deal with a box that had multiple
> interfaces whose names differed; some use of Linux iptables convinced it
> that all outbound SMTP connections had to come from one particular IP
> address, after which setting HELO to be that name was trivial.
>
> Anyone trying to run a mailserver on a dynamic address would likely find
> this sort of thing to be one of the many forms of grief they get.
>

I'm not running on a dynamic IP address but I use a different IP for
sender verification than sending email. And I often have to change IP
addresses when the server gets blacklisted. So I need the HELO to change
to match the IP of the interface I'm using.