On 12/12/2015 7:49 AM, Jeremy Harris wrote:
> On 11/12/15 21:22, Robert Steinmetz AIA wrote:
>> Any email to a gmail server is rejected with a 550-5.7.1 error,
Thank you for a helpful response, unfortunately we are a small
organization and I am the sole system admin. I therefore cannot mount a
crusade to change the major ISPs. In any event we are allocated static
ipv4 ips from our multiple ISPs. We administer them through a third
party DNS host who does not routinely provide ipv6 ptr records..
I was able to overcome the problem with our outgoing postfix server at
one site by forcing ipv4 connections to some domains.
We send all of our incoming email to a central site with a domain wide
MX record and handle it via an exim4 server on Ubuntu 12.04 LTS.
Unfortunately since I manage the entire operation I only very
occasionally need to deal with our email server which has been in place
for many years and is upgraded when Ubuntu comes out with updates or a
new LTS version. I am therefore not really familiar with configuring exim4.
How would one implement your suggestion in an Ubuntu/Debian server?
The git hub link I provided in my original post also seems a valid
approach, but Again, I'm not sure how to implement it in a Debian/Ubuntu
environment.
Please be gentle.
>> One way:
>>
>> dns_ipv4_lookup
>> domain list; lookup only A-records for these domains, not AAAA also.
>>
>> eg:
>>
>> dns_ipv4_lookup = gmail.co
>>
>>
>> (of course, subject to G moving their MX's around).
>>
>> http://exim.org/exim-html-current/doc/html/spec_html/ch-main_configuration.html
>>
