21 Jan
2016
21 Jan
'16
10:46 a.m.
Hoi zäme
I have a couple of customers complaining they are unable to send emails
to hotmail - typically they see rejects such as this:
550 SC-001 (BAY004-MC5F11) Unfortunately, messages
from 88.198.198.124
weren't sent. Please contact your Internet service provider since part
of their network is on our block list.
It doesn't affect all customers and checking our logs, it appears to
have started 18/1. Prior to that we had no problems delivering
outbound mails to hotmail, since then I see 149 bounces with the
message above).
The customers are on dynamic ranges from Swisscom, UPC and e.g. Virgin
(in the UK). Has anyone seen something similar?
--
Per Jessen, Zürich (-0.1°C)
http://www.dns24.ch/ - your free DNS host, made in Switzerland.
21 Jan
21 Jan
11:14 a.m.
Hello,
it could be that you problem is related to DMARC.
big changes are coming, big email providers like gmail,yahoo and I guess
also hotmail are implemeting DMARC. Use of Strict DMARC Policies will
make this big providers reject emails.
https://dmarc.org/2015/10/global-mailbox-providers-deploying-dmarc-to-prote…
Saverio
On 21/01/16 10:46, Per Jessen wrote:
Hoi zäme
I have a couple of customers complaining they are unable to send emails
to hotmail - typically they see rejects such as this:
--
SWITCH
Saverio Proto, Peta Solutions
Werdstrasse 2, P.O. Box, 8021 Zurich, Switzerland
phone +41 44 268 15 15, direct +41 44 268 1573
saverio.proto(a)switch.ch, http://www.switch.ch
http://www.switch.ch/stories
550 SC-001 (BAY004-MC5F11) Unfortunately,
messages from 88.198.198.124
weren't sent. Please contact your Internet service provider since part
of their network is on our block list.
It doesn't affect all customers and checking our logs, it appears to
have started 18/1. Prior to that we had no problems delivering
outbound mails to hotmail, since then I see 149 bounces with the
message above).
The customers are on dynamic ranges from Swisscom, UPC and e.g. Virgin
(in the UK). Has anyone seen something similar?
11:25 a.m.
Saverio Proto wrote:
Hello,
it could be that you problem is related to DMARC.
big changes are coming, big email providers like gmail,yahoo and I
guess also hotmail are implemeting DMARC. Use of Strict DMARC Policies
will make this big providers reject emails.
https://dmarc.org/2015/10/global-mailbox-providers-deploying-dmarc-to-prote…
The senders have not published any DMARC entries - also, sometimes it
works, sometimes it doesn't. I have just tried sending mails
to "postmaster(a)hotmail.com" from a couple of our servers at Hetzner,
same error message. Other messages go through fine. (28 today sofar).
/Per
--
Per Jessen, Zürich (0.2°C)
http://www.dns24.ch/ - free dynamic DNS, made in Switzerland.
22 Jan
22 Jan
7:54 p.m.
i experience this a long time (more than 3 years)
all try to resolve that where without success
a workarround was to use another range in an other AS to send email to
M$ system
On 21/01/2016 06:14, Saverio Proto wrote:
> 550 SC-001 (BAY004-MC5F11) Unfortunately, messages from 88.198.198.124
> weren't sent. Please contact your Internet service provider since part
> of their network is on our block list.
10:09 a.m.
Per Jessen wrote:
Hoi zäme
I have a couple of customers complaining they are unable to send
emails to hotmail - typically they see rejects such as this:
> 550 SC-001 (BAY004-MC5F11) Unfortunately, messages from
> 88.198.198.124 weren't sent. Please contact your Internet service
> provider since part of their network is on our block list.
It is truly weird. Using the same sender and same path, one email
to "some.user(a)hotmail.com" is accepted, another
to "postmaster(a)hotmail.com" is rejected.
--
Per Jessen, Zürich (-0.2°C)
http://www.dns24.ch/ - your free DNS host, made in Switzerland.
5:11 p.m.
It is truly weird. Using the same sender and same
path, one email
to "some.user(a)hotmail.com" is accepted, another
to "postmaster(a)hotmail.com" is rejected.
They are probably ramping up rejection rates slowly, as suggested here:
https://dmarc.org/overview/
25 Jan
25 Jan
10:52 a.m.
Gregor Riepl wrote:
After I filed a support request with Microsoft, they got back to me
fairly quickly and said one of our IP-ranges was "a candidate for
mitigation". No other explanation offered. I don't see this being a
dmarc issue at all, but some sort of internal M$ "reputation list".
Thanks for everyone's suggestions!
--
Per Jessen, Zürich (4.0°C)
http://www.hostsuisse.com/ - dedicated server rental in Switzerland.
It is truly
weird. Using the same sender and same path, one email
to "some.user(a)hotmail.com" is accepted, another
to "postmaster(a)hotmail.com" is rejected.
They are probably ramping up rejection rates slowly, as suggested
here: https://dmarc.org/overview/
5:44 p.m.
Wow at least you got a feedback,
which is more than i got the last 3 years
i have given up, my client know mail delivery to microsoft mailservice
is not guaranted, and i recomend to convince mailpartner for a change
to a more cooperative Mailprovider.
if i´m able to route microsoft mail via relayhosts on IP-ranges/AS
which are not blocked, but i wont spend much time anymore in
timeconsuming workarrounds.
Roger
On 25/01/2016 05:52, Per Jessen wrote:
Gregor Riepl wrote:
After I filed a support request with Microsoft,
they got back to me
fairly quickly and said one of our IP-ranges was "a candidate for
mitigation". No other explanation offered. I don't see this being a
dmarc issue at all, but some sort of internal M$ "reputation list".
Thanks for everyone's suggestions!
It is
truly weird. Using the same sender and same path, one email
to "some.user(a)hotmail.com" is accepted, another
to "postmaster(a)hotmail.com" is rejected.
They are probably ramping up
rejection rates slowly, as suggested
here: https://dmarc.org/overview/
2689
days inactive
2693
days old
7 comments
4 participants
participants (4)
-
Gregor Riepl -
Per Jessen -
Roger -
Saverio Proto