Re: [mailop] !! Increase in outlook.com S3150 rejections

[Lilium via mailop]

Hello,
we had similar issues, sometimes with IP addresses that have NOT been 
sending emails for months.


Approx. one month ago we registered all the IP addresses with SNDS 
(Smart Network Data Service) *and* JMRP (Junk Mail Reporting Program).
Paying great attention to each complaint. The blocks continued but 
slowed down. See https://postmaster.live.com/snds


When re-asking for "delisting/mitigation" in the email reply to "Nothing 
was detected to prevent your mail from reaching Outlook.com customers", 
we always include the error message received for each IP address and the 
notice that under the SNDS control panel the "View IP Status" option 
shows: "All of the specified IPs have normal status".


Regards
Andrea


On 19/02/2024 15:15, Fernando MM via mailop wrote:

Hi,

Over the past two weeks, I started to notice an increase in the number 
of S3150 rejections. Example:


550 5.7.1 Unfortunately, messages from [xxx.xxx.xxx.xxx] weren't sent. 
Please contact your Internet service provider since part of their 
network is on our block list (S3150). You can also refer your provider 
to http://mail.live.com/mail/troubleshooting.aspx#errors 
.


The main issue is that when I contact them at 
https://olcsupport.office.com/ , I 
receive a reply indicating that "Nothing was detected to prevent your 
mail from reaching Outlook.com customers.".


I have to reply and wait for them to escalate. After some time, I 
finally get "We have implemented mitigation for your IP 
(xxx.xxx.xxx.xxx) and this process may take 24 - 48 hours to replicate 
completely throughout our system.".


Asking for more details about the issue doesn't help as they refuse to 
provide any. And the main issue is that the IPs will usually get blocked 
again after a few days.


These IPs never had issues before and, after doing a full review, 
nothing was found on our end. No changes in the content patterns ( 
mainly invoices and order confirmations ), nothing that indicates that 
the server was compromised etc.


I was wondering if anyone else is also experiencing this type of issue?

Thanks.

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Re: [mailop] outlook.com 421 try again later S77719

[Lilium via mailop]

It appears to us that the delay only affects EU SMTP servers.
US SMTP servers delivery is fine.

Regards
Andrea


On 11/10/2023 11:12, Andreas via mailop wrote:

Hello all,

since a few hours we have problems with sending to Microsoft. We get 
hundreds of messages like in the subject with the reference to S77719. 
Also colleagues from other companies in germany are seeing the same in 
their logs. All mails that are blocked here are from Microsoft 
customers, but they are redirected through our servers.


Trying to unblock the IP e.g. via https://sender.office.com/ shows that 
the IPs are not blocked.


Anybody have any idea?

Thanks a lot
Andreas


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Re: [mailop] Sisimai for analysis of bounce reasons

[Lilium via mailop]

On 20/07/2023 03:50, H via mailop wrote:

On July 18, 2023 1:33:20 PM EDT, Lilium via mailop  wrote:


This solution is based on Sisimai:
https://realsender.com/for-email-broadcasters/bouncehandler-app/

It helped a few customers with deliverability issues due to
wrong/inactive recipients in their lists.

The article "how to handle BOUNCED EMAILS" is a summary of our
experience on this matter:
https://realsender.com/email-trends/2021-how-to-handle-bounced-emails/

Andrea


On 17/07/2023 03:47, H via mailop wrote:

Is anyone using sisimai to analyze email bounces? I have just began

using it and am interested in sharing experiences etc. as I have not
found any user mailing list or forum on the net (there is commercial
support though.)


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Thank you for the links. After letting Sinai extract the bounce information, I 
import it into a database for further analysis of the bounce reasons.

The two biggest issues analyzing bounces are:
- The information returned by different mail handlers is not standardized.
- Many bounces are classified as ”undefined” which I have to dig into further. 
One reason could be - have not checked this yet - that some mail handlers may 
return information in a language different than English and some return 
information in English. Our campaigns are in a non-English speaking country.

Do you have any experience with the latter?
___


I haven't made any change in the application settings.
In RealSender configuration the "undefined" errors are skipped.

If you look at the Github releases page:
https://github.com/sisimai/p5-sisimai/releases

There are changes like this one, maybe you can find some hints there:
FrancePTT : add laposte lpn code #441
https://github.com/sisimai/p5-sisimai/pull/441
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Re: [mailop] !! Sisimai for analysis of bounce reasons

[Lilium via mailop]

This solution is based on Sisimai:
https://realsender.com/for-email-broadcasters/bouncehandler-app/

It helped a few customers with deliverability issues due to 
wrong/inactive recipients in their lists.


The article "how to handle BOUNCED EMAILS" is a summary of our 
experience on this matter:

https://realsender.com/email-trends/2021-how-to-handle-bounced-emails/

Andrea


On 17/07/2023 03:47, H via mailop wrote:

Is anyone using sisimai to analyze email bounces? I have just began using it 
and am interested in sharing experiences etc. as I have not found any user 
mailing list or forum on the net (there is commercial support though.)

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Re: [mailop] !! verifier.port25.com

[Lilium via mailop]

I manage this service to validate the SPF and DKIM settings:

1. send an e-mail to s...@tester.realsender.com
2. check online the validation results (it will take a minute to appear)
https://tester.realsender.com/t/spf

Regards
Andrea


On 23/05/2023 20:31, Blake Hudson via mailop wrote:
Looks like the email verification application at verifier.port25.com 
described in this 
(https://postmarkapp.com/blog/port25s-authentication-and-spam-assassin-tool) article may have been shut down.


Anyone have any insight into this or alternative tools for testing DKIM, 
SPF, and similar in one go?


--Blake
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Re: [mailop] Locally hosted anti-spam solution recommendations?

[Lilium via mailop]

Some of our customers use Libraesva:
Libraesva ESG, Enterprise Email Protection, Cloud or On Premise.
https://www.libraesva.com/

Regards
Andrea


On 20/10/2021 15:49, Otto J. Makela via mailop wrote:

We're currently running Roaring Penguin CanIT as our mail frontend,
and have been given an end-of-life notice from the new owners:
https://go.zixcorp.com/index.php/email/emailWebview?md_id=21715

So, now we're looking for a good frontend with antispam functions.

CanIT is a set of open source software (Sendmail, Spamassassin,
blocklists, ClamAV, opendkim etc) packaged with a nice web gui
interface to control it all on a locally hosted Linux server.

And that's basically what we'd also need to replace it.

Some random cloud hosting spam solution is not a viable option,
we're a Finnish government owned contractor. Also we need to know
(if need be) what happened to each and every email coming and going,
not "perhaps our proprietary spam system ate it, we won't tell you"
as so many of these cloud solutions seem to be.

Any recommendations?


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[mailop] Contact from OVH

[Lilium via mailop]

Can someone from OVH please connect with me off list

We are having an issue with some of your IPs on our SMTP service.

Andrea Fava
RealSender.com
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Re: [mailop] DKIM+DMARC at t-online.de (Deutsche Telekom's ISP branche)

[Lilium via mailop]

On 12/04/2021 22:08, Bob Proulx via mailop wrote:


There are many questions about what will actually be implemented.  It
would be extremely useful if t-online.de provided an automated robot
testing address to which email tests could be conducted.  Being able
to test this to an automated robot address would help the community
understand the restrictions being placed there.



I send test messages to:
a...@t-online.de

Regards
Andrea
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Re: [mailop] openspf.org down

[Lilium via mailop]

Hello,

this is a static version taken from web-archive:
http://www.open-spf.org/

source:
https://web.archive.org/web/20190225203208/http://www.openspf.org/

Regards
Andrea

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Re: [mailop] Office 365 - Emails marked as not passing fraud detection

[Lilium]

I can’t figure this one out so looking for some help from people in the 
know. One of our clients has a postfix mail relay server used for 
relaying emails from photocopiers/internal software systems out to the 
world.


Below I’ve pasted the headers of one. Office 365 / Outlook chucks them 
in the junk mail folder with a message “This sender failed our fraud 
detection checks and may not be who they appear to be.”


Hello Shane,
last week I had a similar issue and found this:
How to configure an Office 365 SMTP Relay Connector
https://support.happyfox.com/kb/article/522-office-365-smtp-relay-connector

Unfortunately I haven't been to make it work.

Regards
Andrea

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Re: [mailop] Microsoft Support Form

[Lilium]

I am attempting to put in a support ticket at 
https://support.live.com/eform.aspx?productKey=edfsmsbl3=eformts=wsignin1.0=1 
but I keep getting a service unavailable message. 


Hello Brad,
try using the alternative link suggested here:
https://answers.microsoft.com/en-us/outlook_com/forum/oadmincenter-oother/where-is-the-hotmailoutlook-blacklist-removal-form/23bb8f8b-5fcf-4b97-8157-8e23266818bf?auth=1

Regards
Andrea

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Re: [mailop] dkim signature failures sendmail/opendkim

[Lilium]

Using sendmail with opendkim for signing mostly works, but I have a few
domains with dmarc p=reject, and looking at the aggregate reports, I am
seeing some dkim=fail, spf=pass on a small amount of mail going to
google, comcast, etc. The aggregate reports show that mail is signed
with the right selector (default._domainkey.lynchexhibits.com).



Hello Carl,
I've had dkim signature problems too, they were all related with line 
lenght (max 990 characters).


Some customers sent the content all in one line or had a very long line 
within the html.


In these cases sendmail added exclamation marks and dkim signature was 
broken.


"The default for SMTPLINELIM is 990 (defined in RFC821) and that value 
should not be changed."

http://www.diablotin.com/librairie/networking/sendmail/ch18_08.htm#SML2-CH-18-SECT-8-43

Why it should not be changed:
http://newsgroups.derkeiler.com/Archive/Comp/comp.mail.sendmail/2008-11/msg00038.html

Regards
Andrea


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