[Enigmail] Expect signature header proposal

[Eitan Adler]

Robert J. Hansen wrote:
> Eitan Adler wrote:
>> No: I have defined the problem as: "Enigmail doesn't give effective
>> warnings in the absence of an *expected* signature."
> 
> And, as people have told you several times so far, there is no known way
> to convey an expectation of signature. 
A check box right under "allow remote images" part of the address book 
entry?

  This makes your definition
> nonsense: it's like saying "Enigmail doesn't magically summon unicorns."