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BREAKING NEWS: PowerMTA 5.0 beta is out!!!!  Please contact support@port25.com for a license and download access.

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 1 
 on: Today at 08:46:19 AM 
Started by WillemStam - Last post by WillemStam
In this BLOG post we discuss the implementation of a List-Unsubscribe header and share a use-case. For PMTA users we present an interesting add-on to streamline MAILTO unsubscribe requests.
https://www.postmastery.com/list-unsubscribe-header-critical-for-sustained-email-delivery/

 2 
 on: November 27, 2018, 11:29:56 AM 
Started by ag - Last post by Port25-Admin1
https://www.spamhaus.org/faq/section/Glossary#233

 3 
 on: November 27, 2018, 10:48:10 AM 
Started by WillemStam - Last post by sperotti
Thanks so much for posting this and sharing it with our Forum.  This is valuable information for all of our PowerMTA customers.

 4 
 on: November 27, 2018, 10:36:08 AM 
Started by WillemStam - Last post by WillemStam
At Postmastery, we work for various ESPs and brands to optimise email delivery. Recently, one of our clients faced a mysterious DKIM failure when sending mail to Outlook.com domains.
Please find below the full case description.
https://www.postmastery.com/proper-mime-prevents-dkim-failures-in-outlook/

Our main finding: Use proper encoding and always test your output at a header level with various large ISPs like Outlook, Gmail and Yahoo. We advise using Quoted-Printable transfer encoding for best results.

 5 
 on: November 25, 2018, 11:57:39 AM 
Started by ag - Last post by mailme
hi,
only for my interst (we are not blocked) … how do i identify spamhaus blocks?
i've never heard before the word "snowshoe"

greetings

 6 
 on: November 22, 2018, 04:49:21 AM 
Started by misit - Last post by misit
Hello Keith,

Thanks for the comment.

Yes, it looks like they are using it indeed. But how come its not showing up in my headers?  :-\

Thanks,

Misit

 7 
 on: November 21, 2018, 12:06:58 PM 
Started by misit - Last post by keith
Hello Misit,

According to Microsoft documentation, they do indeed use that header. Here is what I was able to dig up on this end.

"
https://docs.microsoft.com/en-us/exchange/antispam-and-antimalware/antispam-protection/antispam-stamps?view=exchserver-2019
"

-Keith

 8 
 on: November 21, 2018, 11:52:36 AM 
Started by misit - Last post by misit
Hello Everyone,

Just a quick question, I have noticed the header field Outlook.com adds to there header, doesn't seems to be there anymore.

"X-MS-Exchange-Organization-SCL" Does anyone noticed this ? if so, what other options they use to mark a SPAM email?

Thanks In Advance

Misit

 9 
 on: November 21, 2018, 07:06:27 AM 
Started by ag - Last post by Danish
Should be related to snowshoe. But you need to stop mailing from affected IPs to drop the listing faster.

 10 
 on: November 15, 2018, 06:28:18 PM 
Started by ag - Last post by ag
Spamhaus ZEN
and domains are now tagged with Spamhaus DBL


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