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trusteddomainproject / OpenARC

Open source ARC implementation
BSD 2-Clause "Simplified" License
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OpenARC produces invalid Authentication-Results #143

Open glts opened 3 years ago

glts commented 3 years ago

OpenARC produces invalid Authentication-Results headers:

Authentication-Results: mail.example.com; arc=none smtp.remote-ip=2604:8d00:0:1::3

This header is syntactically invalid. The pvalue production does not allow bare colon characters, so here the IP address must be encoded as a quoted-string. The same lack of quoting appears in other pvalues as well. For the BNF see RFC 8601, section 2.2 and RFC 2045, section 5.1.

The correct syntax is:

Authentication-Results: mail.example.com; arc=none smtp.remote-ip="2604:8d00:0:1::3"