Re: [mailop] DKIM signed with parent domain

[Jörg Backschues via mailop]

Am 25.01.24 um 23:58 schrieb Anne Mitchell via mailop:


On Jan 25, 2024, at 3:24 PM, Byron Lunz via mailop  wrote:

Or, you can use https://aboutmy.email/ - not affiliated, just a pleased user.


Yes, absolutely, aboutmy.email rocks!  And, is offered by a very trusted source!


Sorry, but there are issues with AboutMy.email when using multiple DKIM 
signatures e.g. RSA & Ed25519.


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Jörg Backschues

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Re: [mailop] Google not sending DMARC reports since 9/25

[Jörg Backschues via mailop]

Am 03.10.2023 um 11:59 schrieb Faisal Misle via mailop:


We noticed (and looks like so did our counterparts at Dmarcian) that
Google has not been sending DMARC reports since last week.

I'm going to assume Google is already aware of it and is working to
resume sending and we should treat it like a Postmaster Tools or SNDS
blip and just go with the flow.

If anyone else has any other insight or details, I'd love to hear it


Google's DMARC reports come in here regularly:

Received: from mail-ot1-x34a.google.com (mail-ot1-x34a.google.com 
[IPv6:2607:f8b0:4864:20::34a])

(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
	 key-exchange ECDHE (P-384) server-signature RSA-PSS (4096 bits) 
server-digest SHA256)

(No client certificate requested)
by mx0.backschues.net with ESMTPS id 4S0D682xGNz9rxf
for ; Tue,  3 Oct 2023 12:08:00 +0200 (CEST)

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Jörg

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Re: [mailop] Malware waves from hotmail.com

[Jörg Backschues via mailop]

On 04.06.21 at 10:20h  Bjoern Franke wrote via mailop:


since several weeks we are getting several mails a day from hotmail.com
users with subjects like "fob xt k xerhc", an attached malware PDF like
[1] and adressed to ~200 recipients.


The good thing is, that the patterns are very clearly here:

- subject:   3 characters, blank, 2 characters
- body:  4 characters, blank, 2 characters
- file name: 7 characters with .pdf extension

The bad thing is, that there's no feedback from Microsoft's abuse desk 
for several weeks.


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Re: [mailop] Anyone using clustered DoveCot?

[Jörg Backschues via mailop]

On 22.01.2021 at 23:36 Tom Perrine via mailop wrote:

I’d be interested in chatting with anyone who has rolled out (or failed 
to rollout!) Dovecot in a cluster. Especially if you’re using an object 
store.


Please have a look at the transformation of the TelekomMail Platform:



But please consider on Backup and Restore.

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Jörg Backschues
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Re: [mailop] What's the point of secondary MX servers?

[Jörg Backschues via mailop]

On 17.12.20 at 22:21h John Levine wrote via mailop:


But now, in 2020, is there a point to secondary servers? Mail servers
are online all the time, and if they fail for a few minutes or hours,
the client servers will queue and retry when they come back.


IMHO secondary MX servers with a lower priority had been replaced in the 
meantime by an intelligent queuing on the client site.


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Jörg Backschues
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Re: [mailop] New server email being treated as spam by Google

[Jörg Backschues via mailop]

Am 23.11.2020 um 17:29 schrieb Philip Paeps via mailop:


This is all empirical guesswork.


This is my personal experience with deliverability to Google:

- Please read the M³AAWG's "Email Authentication Recommended Best 
Practices" very very carefully 


- In the 1st step define a very low rate limit and restrict the parallel 
connections to the Google SMTP server at a low level.


- Register your mail domains using 

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Re: [mailop] Deutsche Telekom rejects connections because of missing "provider identification"

[Jörg Backschues via mailop]

Am 27.08.2020 um 08:37 schrieb Tom Ivar Helbekkmo via mailop:


T-Online (or Deutsche Telekom) require that somewhere on your domain is
your address visible. Even if you don't have a web page at all. And
just use the domain for sending mails.


If only there were some standardized mechanism for this information...
Someone should make one, I think.  We could call it "whois".  :)


My experience with Deutsche Telekom: I've created a web page like 
 with detailed information about the 
mail service. That has always been accepted in the past by T-Online.


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Jörg

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Re: [mailop] Google and Spam detection

[Jörg Backschues via mailop]

Am 25.07.20 um 04:07 schrieb John Levine via mailop:


Gmail has repeatedly said that they do not accept unauthenticated mail
on IPv6.


Sorry, but I can not confirm this.

I've 16x IPv6 MXs that are working fine with Gmail w/o authentication.

--
Regards
Jörg Backschues

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