[Mailman-Users] Messages discarded by ISP
John W. Baxter
jwblist3 at olympus.net
Sun May 21 02:25:47 CEST 2006
On 5/20/06 4:46 PM, "Antonio Dragone" <dragone_se at hotmail.com> wrote:
> I have configured a mail server with Sendmail on my office and mails are sent
> I'm using MailMan to send a newsletter to a test list of five people, one from
> hotmail, one from gmail, one from yahoo and two from my ISP (including my
> The newsletter is sent fine to all of the recipients (I've checked sendmail
> queue) but for some reason my ISP is discarding the message for their
> addresses (hotmail, gmail and yahoo are working fine).
> I suspect the problem is related to the headers sent by MailMan because when I
> send the newsletter directly from my mail client trough my office server, it
> is received without problems (the only difference between the one sent by
> MailMan and the one sent by my mail client is the headers).
> Is there some special header sent by MailMan that is well known as some kind
> of SPAM header?
The obvious one is
But that's a silly thing to filter on, and it is correct for Mailman to
They might not like
From: <your address with them> coming with the envelope sender.
Or they might be running a silly challenge-response system
All of those would essentially mean that one can't receive messages from
mailing lists at that ISP (or that you have to configure something related
to your account to allow it).
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