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PowerMTA 5.0r3 is out!!!!  Please contact support@port25.com for a license and download access.

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 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.

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.

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


 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?  :-\



 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.



 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


 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.

 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

 on: November 15, 2018, 06:19:56 PM 
Started by ag - Last post by CaLViN
What is the block type ? snowshoe ?

 on: November 15, 2018, 06:17:11 PM 
Started by ag - Last post by ag
dear experts,

we are running Port25 for a while now, with no major issue. We have several blocks of IPs for a total of aroud 250 IPs - 1/2 used.

Today 60% of our IPs  are blocked by spamhaus, on very different set/range of IPs and really different category of traffic - from the nicest to less nice traffic.

IPs are blocked - then ubblocked after 1 hour then blocked again.

Any help would be welcome.

 on: November 15, 2018, 05:03:32 PM 
Started by jmendoza - Last post by jmendoza
What's the best way to "warm" up to Yahoo? Here's what I have changed my config to after emailing back and forth with Port25 Support:

<pattern-list defaultPatterns>
   rcpt-to /@yahoo.com/ virtual-mta=yahooMta

<domain $yahoo>
    max-smtp-out 20
    max-msg-per-connection 4
    smtp-greeting-timeout  5m   #  added in v3.2r17
    mx-connection-attempts 10   # added in v3.2r16
    dk-sign yes
    dkim-identity strict-from
    smtp-pattern-list yahooBackoff
    backoff-to-normal-after 4h  #added in v3.5
    backoff-max-msg-rate 400/h # Use with PowerMTA 3.5
    backoff-retry-after 60m
    backoff-notify emailadmin@somedomain.com

The pattern list I added today to limit the amount of vMTAs from 16 to 2.

Should I include a 'max-msg-rate'?

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