[MlMt] Search for `X-delivered-To` addresses

[leo]

Hi there

Anybody any idea how to search for `X-delivered-To` addresses?

_Background:_ These days many bulk emails are not send with all 
recipients in the _To_ or _Cc_ field. This is principielly a good 
development, but it means that it is harder to search for the real 
recipient’s address (which then is only in the `X-delivered-To` 
field).

I tried

     a [email at address]

but it does _not_ find emails where `email at address` is only in the 
`X-delivered-T` field.

Many thanks for any pointers,
Leo
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