On Sun, Feb 19, 2017 at 03:23:45PM +0000, Phil Ashby wrote:
On 19/02/17 12:00, Chris Green cl@isbd.net wrote:
I have an E-Mail requirement/problem that I've wasted several hours on over the past few days to little effect. Maybe someone here can help.
My home (linux) machine runs all the time and hosts the domain zbmc.eu which is registered at gandi.net. The zone file there is configured to point at my home machine and the MX record is set up too:- chris@cheddar$ host zbmc.eu zbmc.eu has address 84.92.49.234 zbmc.eu mail is handled by 10 zbmc.eu. chris@cheddar$ 84.92.49.234 is my PlusNet ADSL connection.
..[lots of testing that indicates 'something' is blocking SMTP on some routes, but not all...]
Hi Chris,
I have almost the same setup as you, an external/public server (mail.ashbysoft.com) that forwards mail to an internal/private server at home (phil.ashbysoft.com, on PlusNet), my external server is in a co-lo facility and managed by me, rather than a 3rd part but hey, it's still working so it doesn't look like PlusNet per se..
I tried a few tests for your host:
from my home network (via NAT, PlusNet):
phlash@zaphod:~$ host zbmc.eu zbmc.eu has address 84.92.49.234 zbmc.eu mail is handled by 10 zbmc.eu.
phlash@zaphod:~$ telnet zbmc.eu 25 # not looking good for inbound connectivity on 25 Trying 84.92.49.234... ^C
phlash@zaphod:~$ telnet zbmc.eu 587 # nor the alternative SMTP submission port 587 Trying 84.92.49.234... ^C
This is because my firewall blocks connections from anywhere except the TsoHost servers on port 25. ............. der!!!!! Which of course explains mostly why it won't work from elsewhere!!!!!
I think you have just hit the proverbial nail on the proverbial head! :-)
My conclusion so far would be that you have local firewalling / filtering issues that are permitting traffic from the TsoHost servers but nowhere else? Are you running fail2ban and it has been a bit enthusiastic (this has
Spot on! :-)
Hope this helps,
Absolutely, thank you, I can sleep peacefully now! :-)