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Проблемы и их решение 
AhrefsBot - Mozilla/5.0 (compatible; AhrefsBot/5.0; +http://ahrefs.com/robot/)
MJ12bot	 - Mozilla/5.0 (compatible; MJ12bot/v1.4.3; http://www.majestic12.co.uk/bot.php?+)
Detectify - Mozilla/5.0 (compatible; Detectify) +https://detectify.com/bot/
DotBot - Mozilla/5.0 (compatible; DotBot/1.1; http://www.dotnetdotcom.org/, crawler@dotnetdotcom.org)
Riddler - Riddler (http://riddler.io/about)
SemrushBot - Mozilla/5.0 (compatible; SemrushBot/0.97; +http://www.semrush.com/bot.html)
LinkpadBot - Mozilla/5.0 (compatible; LinkpadBot/1.06; +http://www.linkpad.ru)
BLEXBot	Mozilla/5.0 (compatible; BLEXBot/1.0; +http://webmeup-crawler.com/)
FlipboardProxy - Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2), Gecko/20100115 Firefox/3.6 (FlipboardProxy/1.1; +http://flipboard.com/browserproxy)
aiHitBot - Mozilla/5.0 (compatible; aiHitBot/2.9; +https://www.aihitdata.com/about)
trovitBot - Mozilla/5.0 (compatible; trovitBot 1.0; +http://www.trovit.com/bot.html)


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Проблема с eximquotacheck

Проблемы и их решение
Если у вас в логах куча таких запросов:

May 17 18:10:01 s1 eximquotacheck: File '' isn't exists
May 17 18:15:01 s1 eximquotacheck: File '' isn't exists
May 17 18:20:01 s1 eximquotacheck: File '' isn't exists
May 17 18:25:01 s1 eximquotacheck: File '' isn't exists
May 17 18:30:01 s1 eximquotacheck: File '' isn't exists
May 17 18:35:01 s1 eximquotacheck: File '' isn't exists
May 17 18:40:01 s1 eximquotacheck: File '' isn't exists
May 17 18:45:01 s1 eximquotacheck: File '' isn't exists
May 17 18:50:01 s1 eximquotacheck: File '' isn't exists
May 17 18:55:01 s1 eximquotacheck: File '' isn't exists
May 17 19:00:01 s1 eximquotacheck: File '' isn't exists
May 17 19:05:02 s1 eximquotacheck: File '' isn't exists
May 17 19:10:01 s1 eximquotacheck: File '' isn't exists
May 17 19:15:02 s1 eximquotacheck: File '' isn't exists
May 17 19:20:01 s1 eximquotacheck: File '' isn't exists


Решение ее простое.
Надо удалить с cron задачу: /usr/local/ispmgr/sbin/cron.sh sbin/eximquota.check.sh

Иногда бывает такое что тупо не понимаешь почему, а потом внезапно осознаешь это и где решение.