[Mailman-Users] Yahoo spam detection

[Steven D'Aprano]

Some of my Yahoo subscribers are reporting that emails from my mailing 
list are being flagged as spam. As far as I can tell, I'm not using 
spammy words, and the emails are plain text not HTML. I have SPF set up.

One of the Yahoo subscribers kindly forwarded me the full headers and I 
can see these which appear relevant:


X-YahooFilteredBulk:
    150.101.137.129
Received-SPF:
    pass (domain of pearwood.info designates 150.101.137.129 as 
    permitted sender)
X-Originating-IP:
    [150.101.137.129]
Authentication-Results:
    mta1310.mail.bf1.yahoo.com from=pearwood.info; domainkeys=neutral 
    (no sig); from=pearwood.info; dkim=neutral (no sig)
X-IronPort-Anti-Spam-Filtered:
    true
X-IronPort-Anti-Spam-Result:
    AqD1AA1PlVR20UxqPGdsb2JhbABBGoNYWIMEs1KFGUqBUIYAhFwBgQKCMQMgdBc
    BAQEBAQYBAQEBODuEDgYZAQgREgMFAgYYCgQDAQIGAiQCBRYHCAIBBgMCAQIBDx
    AICgQeBQYCAgEUAQIBAgKHdwMQCTy6DYFwhGOJUQ2Fa4EhgWqGfwGCOYJMCgQDA
    QKEfgWDfTAGhB8rgjCDBYJSSYF/gUGCDXQwgjOCBgwhgzaCH4IZgmyCfoFzKjEB
    AQkBdwkXgSABAQE
X-IronPort-SPAM:
    SPAM


Googling suggests that nobody except Cisco can decipher the 
X-IronPort-Anti-Spam header, and they refuse to tell even their 
customers what it means, let alone people like me.

Can anyone suggest something I can do to convince Yahoo I'm not sending 
spam?



Thanks,


-- 
Steve