Сегодня два раза от Google пришло сообщение, что якобы с моего сервера с его ip слишком часто поступают запросы. Полез я в логи почтового сервера и вижу там забитый лог rejectlog десятки мегабайтов такого вида
Пример куска лога (+/-)
2016-06-18 18:30:32 dovecot_login authenticator failed for (User) [155.133.64.15]: 535 Incorrect authentication data (set_id=director)
2016-06-18 18:48:32 dovecot_login authenticator failed for (User) [212.84.160.52]: 535 Incorrect authentication data (set_id=webmaster@playlist24.ru)
2016-06-18 18:48:38 dovecot_login authenticator failed for (User) [212.84.160.52]: 535 Incorrect authentication data (set_id=webmaster@playlist24.ru)
2016-06-18 18:48:40 dovecot_login authenticator failed for (User) [155.133.64.15]: 535 Incorrect authentication data (set_id=display)
2016-06-18 18:48:48 dovecot_login authenticator failed for (User) [212.84.160.52]: 535 Incorrect authentication data (set_id=webmaster@playlist24.ru)
2016-06-18 19:06:51 dovecot_login authenticator failed for (User) [155.133.64.15]: 535 Incorrect authentication data (set_id=dns)
2016-06-18 19:25:00 dovecot_login authenticator failed for (User) [155.133.64.15]: 535 Incorrect authentication data (set_id=doctor)
2016-06-18 19:42:32 dovecot_login authenticator failed for aus1345893.lnk.telstra.net (User) [120.150.96.54]: 535 Incorrect authentication data (set_id=office)
2016-06-18 19:42:55 dovecot_login authenticator failed for (User) [155.133.64.15]: 535 Incorrect authentication data (set_id=dog)
2016-06-18 19:51:28 dovecot_login authenticator failed for (User) [212.84.160.52]: 535 Incorrect authentication data (set_id=postmaster@playlist24.ru)
2016-06-18 19:51:34 dovecot_login authenticator failed for (User) [212.84.160.52]: 535 Incorrect authentication data (set_id=postmaster@playlist24.ru)
2016-06-18 19:51:44 dovecot_login authenticator failed for (User) [212.84.160.52]: 535 Incorrect authentication data (set_id=postmaster@playlist24.ru)
2016-06-18 20:01:01 dovecot_login authenticator failed for (User) [155.133.64.15]: 535 Incorrect authentication data (set_id=dreamer)
2016-06-18 20:19:08 dovecot_login authenticator failed for (User) [155.133.64.15]: 535 Incorrect authentication data (set_id=dummy)
2016-06-18 20:37:07 dovecot_login authenticator failed for (User) [155.133.64.15]: 535 Incorrect authentication data (set_id=edu)
2016-06-18 20:54:28 dovecot_login authenticator failed for (User) [212.84.160.52]: 535 Incorrect authentication data (set_id=postletter@playlist24.ru)
2016-06-18 20:54:34 dovecot_login authenticator failed for (User) [212.84.160.52]: 535 Incorrect authentication data (set_id=postletter@playlist24.ru)
2016-06-18 20:54:44 dovecot_login authenticator failed for (User) [212.84.160.52]: 535 Incorrect authentication data (set_id=postletter@playlist24.ru)
2016-06-18 18:48:32 dovecot_login authenticator failed for (User) [212.84.160.52]: 535 Incorrect authentication data (set_id=webmaster@playlist24.ru)
2016-06-18 18:48:38 dovecot_login authenticator failed for (User) [212.84.160.52]: 535 Incorrect authentication data (set_id=webmaster@playlist24.ru)
2016-06-18 18:48:40 dovecot_login authenticator failed for (User) [155.133.64.15]: 535 Incorrect authentication data (set_id=display)
2016-06-18 18:48:48 dovecot_login authenticator failed for (User) [212.84.160.52]: 535 Incorrect authentication data (set_id=webmaster@playlist24.ru)
2016-06-18 19:06:51 dovecot_login authenticator failed for (User) [155.133.64.15]: 535 Incorrect authentication data (set_id=dns)
2016-06-18 19:25:00 dovecot_login authenticator failed for (User) [155.133.64.15]: 535 Incorrect authentication data (set_id=doctor)
2016-06-18 19:42:32 dovecot_login authenticator failed for aus1345893.lnk.telstra.net (User) [120.150.96.54]: 535 Incorrect authentication data (set_id=office)
2016-06-18 19:42:55 dovecot_login authenticator failed for (User) [155.133.64.15]: 535 Incorrect authentication data (set_id=dog)
2016-06-18 19:51:28 dovecot_login authenticator failed for (User) [212.84.160.52]: 535 Incorrect authentication data (set_id=postmaster@playlist24.ru)
2016-06-18 19:51:34 dovecot_login authenticator failed for (User) [212.84.160.52]: 535 Incorrect authentication data (set_id=postmaster@playlist24.ru)
2016-06-18 19:51:44 dovecot_login authenticator failed for (User) [212.84.160.52]: 535 Incorrect authentication data (set_id=postmaster@playlist24.ru)
2016-06-18 20:01:01 dovecot_login authenticator failed for (User) [155.133.64.15]: 535 Incorrect authentication data (set_id=dreamer)
2016-06-18 20:19:08 dovecot_login authenticator failed for (User) [155.133.64.15]: 535 Incorrect authentication data (set_id=dummy)
2016-06-18 20:37:07 dovecot_login authenticator failed for (User) [155.133.64.15]: 535 Incorrect authentication data (set_id=edu)
2016-06-18 20:54:28 dovecot_login authenticator failed for (User) [212.84.160.52]: 535 Incorrect authentication data (set_id=postletter@playlist24.ru)
2016-06-18 20:54:34 dovecot_login authenticator failed for (User) [212.84.160.52]: 535 Incorrect authentication data (set_id=postletter@playlist24.ru)
2016-06-18 20:54:44 dovecot_login authenticator failed for (User) [212.84.160.52]: 535 Incorrect authentication data (set_id=postletter@playlist24.ru)
Все почтовые ящики, которые перебираются в логах, не существуют, ip неизвестные. Что за беда, это кто-то почтовый сервер хочет хакнуть?