my $mime = PublicInbox::Eml->new(\$_);
$mime->header_set('From' => 'bw@g');
$mime->header_set('To' => 'git@vger.kernel.org');
my $mime = PublicInbox::Eml->new(\$_);
$mime->header_set('From' => 'bw@g');
$mime->header_set('To' => 'git@vger.kernel.org');