Yes, spammers have ruined the internet for everyone. I think the problem
here might be that your site MX record doesn't point at the sender IP. You
should also consider implementing DKIM, as the mail agent would probably
look at that rather than the MX record.
Thanks
Bruce
On Mon, Jul 16, 2018 at 3:10 PM, Alan Beard <bear...@unixservice.com.au>
wrote:
> Hi Don,
>
> Your mail server is blocking my email replies to you, direct.
>
> From my Sendmail log:
>
> >>> MAIL From:<bear...@unixservice.com.au> SIZE=3964
> <<< 550-Requested action not taken: mailbox unavailable
> <<< 550 invalid DNS MX or A/AAAA resource record
>
> bash-4.3$ host -t mx unixservice.com.au
> unixservice.com.au mail is handled by 5 mail.unixservice.com.au.
> bash-4.3$ host mail.unixservice.com.au.
> mail.unixservice.com.au is an alias for naomi.unixservice.com.au.
> naomi.unixservice.com.au has address 60.242.216.157
> bash-4.3$ host 60.242.216.157
> 157.216.242.60.in-addr.arpa domain name pointer
> 60-242-216-157.static.tpgi.com.au.
> bash-4.3$ host 60-242-216-157.static.tpgi.com.au.
> 60-242-216-157.static.tpgi.com.au has address 60.242.216.157
>
> My mail server on my ADSL internet line with a fixed IP address.
>
>
> Thanks
>
> Alan VK2ZIW
>
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--
Bruce Perens K6BP - CEO, Legal Engineering
Standards committee chair, license review committee member, co-founder,
Open Source Initiative
President, Open Research Institute; Board Member, Fashion Freedom
Initiative.
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