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PowerMTA 5.5r1 is out!!!!  Please contact support@port25.com for a license and download access.

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 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'?

 on: November 15, 2018, 11:17:07 AM 
Started by jmendoza - Last post by ReyM
There are very many things that go into your "email reputation" ... Senderscore is only 1 very small part of it (and not as widely used as it once was). The main free email providers (gmail, hotmail, aol, etc.) all use many, many metrics to figure you out... that includes:
IP address
IP neighbors
From Address
Reply-To Address
Other Email Headers
etc, etc, etc.

so when you move to a new geo and new IP addresses you need to start small and grow your send volume and establish a positive pattern. Many ISPs will only allow so many messages from a new / unseen IP address until they "prove themselves" as a good IP sender, etc.

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