17db96d56Sopenharmony_ciContent-Type: multipart/mixed; boundary="AAA" 27db96d56Sopenharmony_ciFrom: Mail Delivery Subsystem <xxx@example.com> 37db96d56Sopenharmony_ciTo: yyy@example.com 47db96d56Sopenharmony_ci 57db96d56Sopenharmony_ciThis is a MIME-encapsulated message 67db96d56Sopenharmony_ci 77db96d56Sopenharmony_ci--AAA 87db96d56Sopenharmony_ci 97db96d56Sopenharmony_ciStuff 107db96d56Sopenharmony_ci 117db96d56Sopenharmony_ci--AAA 127db96d56Sopenharmony_ciContent-Type: message/rfc822 137db96d56Sopenharmony_ci 147db96d56Sopenharmony_ciFrom: webmaster@python.org 157db96d56Sopenharmony_ciTo: zzz@example.com 167db96d56Sopenharmony_ciContent-Type: multipart/mixed; boundary="BBB" 177db96d56Sopenharmony_ci 187db96d56Sopenharmony_ci--BBB-- 197db96d56Sopenharmony_ci 207db96d56Sopenharmony_ci--AAA-- 21