Comment 10 for bug 1525048
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| Stuart Gathman (stuart-gathman) wrote | #10 |
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Bug 799175 reminds me that From is special in another way. You can have more than one of frozen_sign headers - N headers are signed N+1 times to freeze the number (detect additions when checking the signature). There is a list of headers that mail RFCs say MUST occur at most once - however Scott says we shouldn't try to enforce mail RFCs. However, the whole concept of DKIM depends on there being ONE and ONLY ONE From header. The rest are elaborations. Putting 'from' in a MUST list expresses the ONE specialness, but not the ONLY ONE specialness.