[spfbis] SPDF Domain Name Syntax

Tobias Perschon <tobias@perschon.at> Mon, 02 May 2016 18:55 UTC

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From: Tobias Perschon <tobias@perschon.at>
To: "spfbis@ietf.org" <spfbis@ietf.org>
Thread-Topic: SPDF Domain Name Syntax
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Date: Mon, 2 May 2016 18:55:37 +0000
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Subject: [spfbis] SPDF Domain Name Syntax
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Dear Sir or Madam,

I have a question regarding RFC 7208. Is a domain name e.g. for an "a:" directive supposed to be a FQDN; more precisely: can a domain name contain a trailing dot?
e.g.: should this be able to be handled by any software that implements spf:
v=spf1 a:domain.com. ~all

Postfix for example has no problems with an domain name with trailing dot but I have found a software "mdeamon" which cannot perform a dns lookup if the domain name is a FQDN (with trailing dot). I wrote the developers but they say, they think it's not a bug in their software because "all of the pages about SPF, don't talk about domains with trailing dot" and the RFC does not make it explicit if a FQDN is acceptable.

I hope you can clarify.

Kind regards,
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Tobias Perschon
Bitconnect EDV/IT Dienstleistungen & Handel e.U.
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