Dave Howorth wrote:
When you receive that listing, it is because your receiving mailserver has bounced something the list server tried to deliver.
This is one of the bounce messages:
554 5.7.9 Message not accepted for policy reasons.
One example is Paul who has an SPF record that prohibits mails sent by his domain from any other source than his MX.
I'm not sure I understand. You mean Paul sends a message that contains an SPF record (which I've heard of but don't really understand) and that the list forwards his mail to list recipients still containing the same SPF record? And some recipient's mailservers (presumably my ISP?) who bother to check for such things consequently discard it as from the wrong source?
Not quite, no. :-) In his DNS, Paul has set up an SPF record for his domain "paul-neuwirth.nl". This record is public and informs everyone which server is allowed to send mails from "@paul-neu...". It also says what to do when mails are sent from a server not listed. When Paul posts to this list: a) from @paul-neu... to mx.suse.de (our inbound mailserver). An SPF check here will be positive - mail from @paul-neu... from a permitted server. All good. b) mail is now forwarded from mx.suse.de to lists.o.o. This is internal, no SPF checks done. c) mail is now sent to all list subscribers, also paka@o.o. This is eventually mapped to Patrick's own email address and d) sent to a mailserver, in this case one of Yahoo's. e) Yahoo does an SPF check, which fails as the mail from @paul-neu... is now being sent by mx.suse.de which is not listed in the SPF record. f) the policy says to refuse any mail not coming from a listed server, so Yahoo correctly / immediately bounces the mail. g) the bounce eventually ends up on the list server being flagged as "could not deliver to paka@". -- Per Jessen, Zürich (3.0°C) member, openSUSE Heroes. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org