Re: [mailop] microsofts SNDS unavailable - anyone else?

[Jan-Philipp Benecke via mailop]

It works for me. But we saw this behavior already yesterday.

// Jan-Philipp
Jan-Philipp Benecke
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E-Mail: j...@cleverreach.com 

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Stefan Bauer via mailop schrieb am 23.07.20 um 07:38:

microsofts SNDS unavailable - anyone else?

https://postmaster.live.com/snds/


throws:


  Server Error in '/SNDS' Application.




/Runtime Error/

*Description: *An exception occurred while processing your request. 
Additionally, another exception occurred while executing the custom 
error page for the first exception. The request has been terminated.



Anyone else?


Stefan



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Re: [mailop] Google: 'Low reputation of the sending domain'

[Jan-Philipp Benecke via mailop]

Hey Benoit,

i'm facing the same issue since weeks with my private mailserver.
A few mails getting through and some not.
I've already tried to contact the sender support trough their form. 
Maybe this helps, lets see.


BTW: I'v enabled SPF, DKIM, DMARC (p=none) since a long time, this 
either didn't help.


Best,
Jan-Philipp

Jan-Philipp Benecke
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E-Mail: j...@cleverreach.com 

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Benoit Panizzon via mailop schrieb am 02.06.20 um 10:37:

Hi Gang

My personal mailserver is not able to send any emails to gmail accounts
since several months. I was hoping this would solve itself eventually.
It did not.

There are no breaches or spam or anything sent from that server. I
would know as I am part of the AS6772 Abuse Desk. :-) Just the
dozed or so emails per day sent by my family members and myself.

Even emails to my own Gmail Account where my sending email address for
sure is a know past sender, are being blocked.

The Error:

- Transcript of session follows -
... while talking to gmail-smtp-in.l.google.com.:

DATA

<<< 550-5.7.1 [2001:4060:dead:beef::1  19] Our system has detected that this
<<< 550-5.7.1 message is likely suspicious due to the very low reputation of the
<<< 550-5.7.1 sending domain. To best protect our users from spam, the message 
has
<<< 550-5.7.1 been blocked. Please visit
<<< 550 5.7.1  https://support.google.com/mail/answer/188131 for more 
information. ds3si1043668ejc.545 - gsmtp
554 5.0.0 Service unavailable

1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.f.e.e.b.d.a.e.d.0.6.0.4.1.0.0.2.ip6.arpa domain 
name pointer magma.woody.ch.

magma.woody.ch has address 157.161.57.1
magma.woody.ch has IPv6 address 2001:4060:dead:beef::1

No DNS PTR issue I guess :-)

I have registered woody.ch and magma.woody.ch with Gmail Postmaster
Tools about one month ago, in the hope that eventually I would get some
hint to the cause.

Still 'Spamrate' and 'IP Reputation' and 'Domain Reputation' (all other
items too) still show 'there is no data available yet'.

Not listed in any blacklists @ MXToolbox.

An SPF record exists since several years.

woody.ch descriptive text "v=spf1 ip4:157.161.57.0/27 ip6:2001:4060:dead::/48 
-all"

Yesterday, after re-reading google email recommendations, I also added a
DMARC entry:

_dmarc.woody.ch descriptive text "v=DMARC1; p=reject; rua=mailto:paniz...@woody.ch; 
ruf=mailto:paniz...@woody.ch; aspf=s"

Still the problem persists as of a couple minutes ago.

DKIM is not a solution. I faced too many problems with mailinglists
and similar which did alter the header and broke DKIM signatures.

Has anyone a hint what could be the cause for this problem?

And yes, disabling IPv6 seems to solve the issue, but that is the wrong
way dealing with it :-)

Mit freundlichen Grüssen

-Benoît Panizzon-


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Re: [mailop] Ewetel postmaster wanted - your IP 116.203.31.6 seems to be dynamic - please use the smarthost of your ISP

[Jan-Philipp Benecke via mailop]

Hey Stefan,

we hadn't any problems with them. We wrote them about our block on 
14.01. and they did respond on the same day.
When did you wrote them ? Did your wrote postmas...@ewetel.net or did 
you wrote postmas...@ewe.net ?


Based on their answer, i think they have a internal list with dynamic ip 
ranges.


Best,
Jan-Philipp

Jan-Philipp Benecke
Deliverability Engineer

Fon: +49 4402 97390-00 
E-Mail: j...@cleverreach.com 

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Stefan Bauer via mailop schrieb am 09.03.20 um 15:03:
AW: [mailop] Ewetel postmaster wanted - your IP 116.203.31.6 seems to 
be dynamic - please use the smarthost of your ISP


Hi,


it's just DNS round robin for our senders. did not had a sigle issue 
with that over the previous 2 years.



Still thinking, that ewetel/ewe just uses ancient RBLs, that reports 
the specific IP from a dynamic-block.



Stefan



-Ursprüngliche Nachricht-
*Von:* Vytis Marciulionis 
*Gesendet:* Montag 9 März 2020 14:52
*An:* Stefan Bauer 
*CC:* mailop 
*Betreff:* Re: [mailop] Ewetel postmaster wanted - your IP
116.203.31.6 seems to be dynamic - please use the smarthost of
your ISP

Hi Stefan,

This could also happen because your PTR record of sending IP
address resolves with 3 IPs e:
IP  116.203.31.6 - PTR securetransport.cubewerk.de
 - IPs 178.254.23.77;
116.203.31.6; 188.68.39.254

I know that technically it is nothing bad but, I can imagine why
some sensors could return errors, especially since the 3 IP
addresses are from different ASNs:
image.png

I guess those 3 IPs are set as fallback in this situation?


On Mon, Mar 9, 2020 at 11:03 AM Stefan Bauer via mailop
mailto:mailop@mailop.org>> wrote:

Never had delivery issues from hetzner-blocks so far (crossing
fingers) but I'm aware of the past.


Looks like there is at least one RBL around, that list our IP
as dynamic.

https://www.rbl-dns.com/bl?ip=116.203.31.6

One just have to pay to get de-listed. What a wonderful world.


Stefan


-Ursprüngliche Nachricht-
*Von:* Andrew C Aitchison mailto:and...@aitchison.me.uk>>
*Gesendet:* Montag 9 März 2020 10:47
*An:* Stefan Bauer mailto:stefan.ba...@cubewerk.de>>
*CC:* mailop mailto:mailop@mailop.org>>
*Betreff:* Re: [mailop] Ewetel postmaster wanted - your IP
116.203.31.6 seems to be dynamic - please use the
smarthost of your ISP

On Mon, 9 Mar 2020, Stefan Bauer via mailop wrote:

> Any ewetel postmaster around? One of our IPs (subject) get flagged
> as dynamic during delivery to ewetel. However this IP is static.

I am not surprised that Ewetel has guessed wrong:
whois 116.203.31.6 -hwhois.ripe.net 
gives a /16 belonging to our old friends Hetzner.

-- 
Andrew C. Aitchison	Kendal, UK

and...@aitchison.me.uk 


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+37064734475



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[mailop] Hotmail delivery issues

[Jan-Philipp Benecke via mailop]

Hey List,

currently we've delivery problems to hotmail/outlook/... O365 looks good.
SNDS shows us just red for all our IPs since end of September.
We haven't changed anything neither some crappy mailings nor new
spamming customers.
We've done, with our abuse department, also a random review of the
mailings. No results.
Our complaint rate is below 0.1% and just a few spamtrap hits, but
compared to the sending amount this is minimal.

We do not have a clue what this has caused. 
I've already contacted the deliverability support (multiple times), but
more than "do not qualify for mitigation at this time" or "At this
point, I would suggest that you review and comply with Outlook.com's
technical standards." as a reply i do not get. It is just ticket ping pong.

Is here someone who also sees the same problem ? Is it maybe a more
general problem ?
Is here someone, maybe from the hotmail department, who can maybe help ?

Thanks a lot for your time.

Cheers,
Jan-Philipp

-- 
 
 
 
Jan-Philipp Benecke
Deliverability Engineer

Fon: +49 4402 97390-00 
E-Mail: j...@cleverreach.com 

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Re: [mailop] Reg. false positive bounces at Yahoo ISP

[Jan-Philipp Benecke via mailop]

Hey,

is there an other mailbox provider who supports this RFC ?

Best,
Jan-Philipp

Am 13.11.19 um 20:17 schrieb Lili Crowley via mailop:
> Hey Brandon-
>
> Yes we support it. 
>
> Thanks. 
>
> On Wed, Nov 13, 2019 at 2:02 PM Brandon Long via mailop
> mailto:mailop@mailop.org>> wrote:
>
> Does anyone use Yahoo's Require-Recipient-Valid-Since for sending
> ESP mail?
>
> Do they still support that after the merger with Oath?
>
> Brandon
>
> On Wed, Nov 13, 2019 at 5:29 AM Vaibhav via mailop
> mailto:mailop@mailop.org>> wrote:
>
> Hi Vytis,
>
> Yes we validated the same where we could see same account is
> exist in real world & engaged with brand emails in past 30 days.
>
> --Vaibhav
>
> On Wed, Nov 13, 2019 at 6:48 PM Vytis Marciulionis
>  > wrote:
>
> Hi Vaibhav,
>
> Are you able to confirm that those mailbox really exist?
> Occasionally Yahoo cleans up their mailboxes, so some
> times bounces may increase. On our end I do not see any
> increases in bounces in the last 24 hours. 
>
> Regards,
> Vytis
>
> On Wed, Nov 13, 2019 at 7:25 AM Vaibhav via mailop
> mailto:mailop@mailop.org>> wrote:
>
> Hi Everyone,
>
> Recently we observed we are getting false bounce
> reason within month time. As per our analysis Yahoo is
> throwing bounce reason as " *554 delivery error: dd
> This user doesn't have a yahoo.com 
> account* ([EMAIL]) "
>
> We identify the same issue across our customers. Few
> customer we noticed around ~25% false positive bounces.
>
> Here is sample for one user,
>
> _*Email bounced :*_
>
> 2019-09-30 16:37:24
> mta5.am0.yahoodns.net 
> (98.136.96.77)
> 554 delivery error: dd This user doesn't have a
> yahoo.com  account ([EMAIL]) [-9] -
> mta4274.mail.ne1.yahoo.com
> 
>
> _*Email successfully delivery :
> *_
>
> 2019-10-31 11:54:11
> mta5.am0.yahoodns.net 
> (98.136.96.76)
>
> --Vaibhav
>
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> -- 
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> -- 
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> Postmaster
> Verizon Media
>
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[mailop] Comcast postmaster for throttling

[Jan-Philipp Benecke via mailop]

Hey there,

hoping there is someone from comcast on list with whom we can talk about
throttling.
We tried to reach out to them at postmaster@.

Can someone may contact me off-list to talk about throttling ?
Or does somebody knows someone who can help ?

Thanks a lot.

Have a nice day,
Jan-Philipp

-- 
 
 
 
Jan-Philipp Benecke
Deliverability Team

Fon: +49 4402 97390-00 
E-Mail: j...@cleverreach.com 

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[mailop] A1/aon.at contact

[Jan-Philipp Benecke via mailop]

Hey together,

hoping there is someone from aon.at/A1 on list.
We tried to reach out to you but your postmaster@ mailbox exceeded the
quota ;)

Can someone may contact me off-list ?

Thanks a lot.

Have a nice day,
Jan-Philipp

 
 
 
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Deliverability Team

Fon: +49 4402 97390-16 
E-Mail: j...@cleverreach.com 

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