Re: why? [Fwd: Delivery Notification: Delivery has timed out and failed]

[cjw44@flatline.org.uk (Colin Watson)]

Erik Steffl <steffl@bigfoot.com> wrote:
>  some of my messages that I send to debian-user go through just fine
>but ome of them are delayed and fail (not sure if all delayed ones fail
>in the end). Any ideas why this is happening?

Ignore them. If they don't come from your ISP or from *.debian.org,
chances are that they're from some extremely stupid ISP who (a) don't
understand that they should send bounce messages to the SMTP envelope
sender and not the address in the From: line [1], and possibly (b) don't
understand that the recipient is the SMTP envelope recipient and not the
address in the To: line. Admins of mail servers like this often cause
problems with mailing lists; you could mail postmaster@whatever.domain
about it if you were feeling energetic.

[1] For Debian lists, if, say, a message from debian-user had got to the
    list and was being distributed to foo@example.com, the envelope
    sender would be bounce-debian-user=foo=example.com@lists.debian.org.

-- 
Colin Watson                                     [cjw44@flatline.org.uk]