Date: Mon, 3 Sep 2018 16:44:13 -0400 From: Chris Gordon <freebsd@theory14.net> To: William Dudley <wfdudley@gmail.com> Cc: "James B. Byrne" <byrnejb@harte-lyne.ca>, freebsd-questions <freebsd-questions@freebsd.org> Subject: Re: DKIM is driving me nuts Message-ID: <7CB447CE-B9D5-4E4C-8E10-A431FC8C779E@theory14.net> In-Reply-To: <CAFsnNZ%2BiHrnQAzJPwj%2Bb8i4ML0c=dXOsn3UzhhyDrTB6EHn=hg@mail.gmail.com> References: <mailman.104.1535976002.94972.freebsd-questions@freebsd.org> <2d9ca6fc33b9aa430233bc0862b65453.squirrel@webmail.harte-lyne.ca> <CAFsnNZ%2BiHrnQAzJPwj%2Bb8i4ML0c=dXOsn3UzhhyDrTB6EHn=hg@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
The values in the SigningTable do this mapping. The opendkim.comf man = page talks about this, but it can be really confusing until you see it = all pieced together. First, you can use the same key to sing all mail = from your domain, so you don=E2=80=99t have to create a different key = for each host. =20 Here=E2=80=99s what I have (edited for your domain) and assuming you = want to use the same key for everything in casano.com: - In /usr/local/etc/mail/opendkim.conf, I have the following settings, = among others -- mostly defaults: SigningTable refile:/usr/local/etc/mail/signing_table KeyTable file:/usr/local/etc/mail/key_table - /usr/local/etc/mail/signing_table should have: *@casano.com mail._domainkey.casano.com - Then in /usr/local/etc/mail/key_table, you have: mail._domainkey.casano.com casano.com:mail:/path/to/the/keyfile The SigningTable matches the domain to value on the right hand side. = Then looks up that value in the KeyTable to get the path to the key to = use to sign. There may be other ways to do this (I actually sign a = couple of domains with different keys, so I have more lines in my to = table files) and it=E2=80=99s been a while since I set it up, so I=E2=80=99= m a bit rusty and may have something a bit off. Hope that helps. Chris > On Sep 3, 2018, at 3:34 PM, William Dudley <wfdudley@gmail.com> wrote: >=20 > I have an SPF record. >=20 > That is not the problem. >=20 > The problem is that the server has three names: >=20 > casano.com > mail.casano.com > dudley.casano.com >=20 > and I cannot figure out how opendkim chooses which key > to use to sign emails. Does it look at Message-Id? Does it look > at Reply-to: (unlikely) ? Whatever field it uses, changes depending > on if I use Thunderbird, Mail (mailx), or the mailman listserve to = send > the email. >=20 > Thanks, > Bill Dudley >=20 >=20 > This email is free of malware because I run Linux. >=20 > On Mon, Sep 3, 2018 at 3:03 PM, James B. Byrne <byrnejb@harte-lyne.ca> > wrote: >=20 >>=20 >> On Sun, September 2, 2018 19:06, William Dudley wrote: >>> I'm trying to make DKIM work on my FreeBSD 10.3, stock sendmail >>> system. >>> Since I don't know if the problem is sendmail or opendkim or DNS or >>> what, I'm asking here. >>>=20 >>=20 >> You need a sender policy framework specification in your dns for the >> domains you wish secured. You do not put the keys in this, just the >> policy version, the authorised hosts, and the disposal option. >>=20 >> Ours is: >>=20 >> harte-lyne.ca. 172800 IN TXT >> "v=3Dspf1 ip4:209.47.176.16/26 ip4:216.185.71.0/26 >> ip4:216.185.71.128/26 -all" >>=20 >> The ~all at the end is called a soft fail. It means that recipients >> may accept mail from another server, but that the sender should be >> viewed with suspicion. If you change the disposal option to -all you >> are directing the recipient to reject mail from any server other than >> these. The soft fail approach is safer and recommended. >>=20 >> If you employ dkim without a dns entry for your sender policy >> framework, or with invalid SPF or multiple SPF dns records, then the >> correct behaviour is to reject all mail from the sender since the >> policy cannot be determined. >>=20 >> -- >> *** e-Mail is NOT a SECURE channel *** >> Do NOT transmit sensitive data via e-Mail >> Do NOT open attachments nor follow links sent by e-Mail >>=20 >> James B. Byrne mailto:ByrneJB@Harte-Lyne.ca >> Harte & Lyne Limited http://www.harte-lyne.ca >> 9 Brockley Drive vox: +1 905 561 1241 >> Hamilton, Ontario fax: +1 905 561 0757 >> Canada L8E 3C3 >>=20 >>=20 > _______________________________________________ > freebsd-questions@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to = "freebsd-questions-unsubscribe@freebsd.org"
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?7CB447CE-B9D5-4E4C-8E10-A431FC8C779E>