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add flag to ruleset that indicates a message is forwarded, slightly modifying how junk analysis is done

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part of PR #50 by bobobo1618
This commit is contained in:
Mechiel Lukkien
2023-08-09 22:31:37 +02:00
parent 9c31789c56
commit 01bcd98a42
17 changed files with 294 additions and 45 deletions
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20
config/doc.go
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@ -698,7 +698,7 @@ describe-static" and "mox config describe-domains":
-
# Matches if this regular expression matches (a substring of) the SMTP MAIL FROM
# address (not the message From-header). E.g. user@example.org. (optional)
# address (not the message From-header). E.g. '^user@example\.org$'. (optional)
SMTPMailFromRegexp:
# Matches if this domain matches an SPF- and/or DKIM-verified (sub)domain.
@ -715,7 +715,21 @@ describe-static" and "mox config describe-domains":
HeadersRegexp:
x:
# Influence spam filtering only, this option does not change whether a message
# Influences spam filtering only, this option does not change whether a message
# matches this ruleset. Can only be used together with SMTPMailFromRegexp and
# VerifiedDomain. SMTPMailFromRegexp must be set to the address used to deliver
# the forwarded message, e.g. '^user(|\+.*)@forward\.example$'. Changes to junk
# analysis: 1. Messages are not rejects for failing a DMARC policy, because a
# legitimate forwarded message without valid/intact/aligned DKIM signature would
# be rejected because any verified SPF domain will be 'unaligned', of the
# forwarding mail server. 2. The sending mail server IP address, and sending EHLO
# and MAIL FROM domains and matching DKIM domain aren't used in future
# reputation-based spam classifications (but other verified DKIM domains are)
# because the forwarding server is not a useful spam signal for future messages.
# (optional)
IsForward: false
# Influences spam filtering only, this option does not change whether a message
# matches this ruleset. If this domain matches an SPF- and/or DKIM-verified
# (sub)domain, the message is accepted without further spam checks, such as a junk
# filter or DMARC reject evaluation. DMARC rejects should not apply for mailing
@ -726,7 +740,7 @@ describe-static" and "mox config describe-domains":
# (optional)
ListAllowDomain:
# Influence spam filtering only, this option does not change whether a message
# Influences spam filtering only, this option does not change whether a message
# matches this ruleset. If a message is classified as spam, it isn't rejected
# during the SMTP transaction (the normal behaviour), but accepted during the SMTP
# transaction and delivered to the specified mailbox. The specified mailbox is not