Отправил тут Zhbert'у zip-архив с yandex'а на gmail.com. И получил следующее:
Reporting-MTA: dns; forward4.mail.yandex.net
X-Yandex-Queue-ID: 35E556AD8B66
X-Yandex-Sender: rfc822; lubyagin@yandex.ru
Arrival-Date: Tue, 21 Dec 2010 15:50:50 +0300 (MSK)
Final-Recipient: rfc822; zhbert@gmail.com
Original-Recipient: rfc822;zhbert@gmail.com
Action: failed
Status: 5.7.0
Remote-MTA: dns; gmail-smtp-in.l.google.com
Diagnostic-Code: smtp; 552-5.7.0 Our system detected an illegal attachment on
your message. Please 552-5.7.0 visit
http://mail.google.com/support/bin/answer.py?answer=6590 to 552 5.7.0
review our attachment guidelines. s4si4282955faa.76
596
Ради блага пользователей, разумеется. Вирусы-ж.