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Kevin Falcone authored
As documented in issues #20691, Amazon's smarthost service (SES) is requiring X prefixes, and while we're technically correct according to RFC2822 and RFC6648, it's easier to be more liberal in what we generate and not cause problems for users of these services. This change does not address other problems noted in that ticket, such as SES claiming that a message/rfc822 cannot be inlined.
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