development: the rule's example cites the function Postfix really has
The example comment named check_sender_login() and strcasecmp; Postfix 3.7.11 compares the login in reject_auth_sender_login_mismatch() with strcasecmp_utf8 (src/smtpd/smtpd_check.c:3913, 3936). Found by the heuristics inventory - the rule's own example was written from memory. Says where the Debian sources are fetched from and kept. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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@@ -227,10 +227,17 @@ what it relies on and where that is written, for the version the image runs
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(the Debian bookworm package, not upstream's head):
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```go
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// Postfix 3.7.11, src/smtpd/smtpd_check.c, check_sender_login():
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// the SASL login is compared with the sender map's owners by strcasecmp.
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// Postfix 3.7.11, src/smtpd/smtpd_check.c,
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// reject_auth_sender_login_mismatch(): the SASL login is compared with
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// each owner in sender_login_maps by strcasecmp_utf8.
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```
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The Debian sources of the image's versions are fetched with `apt-get source`
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inside a `debian:bookworm` container (`postfix`, `opendkim`, `cyrus-sasl2`,
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`supervisor`, `logrotate`); `dev/upstream/` (not in git) is where they are
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kept for reading. Go modules are read in the module cache at the version
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`go.mod` pins.
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A document instead of source: its URL and section. Where neither answers the
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question, the comment says so and what was measured instead - "measured on
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the e2e stand, 2026-10-14: ..." - and a measurement is never written as if
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