从昨天开始，我在这些日志里就有无数的这些¹。 IP上的whois显示
$ whois 23.97.134.64 ... NetRange: 23.96.0.0 - 23.103.255.255 CIDR: 23.96.0.0/13 OriginAS: AS8075 NetName: MSFT NetHandle: NET-23-96-0-0-1 Parent: NET-23-0-0-0-0 NetType: Direct Assignment RegDate: 2013-06-18 Updated: 2013-06-18 Ref: http://whois.arin.net/rest/net/NET-23-96-0-0-1 OrgName: Microsoft Corporation OrgId: MSFT Address: One Microsoft Way City: Redmond StateProv: WA PostalCode: 98052 Country: US RegDate: 1998-07-10 Updated: 2013-08-21 ... 微软试图破解我的邮件服务器？
¹
May 27 19:24:33 31337 postfix/smtps/smtpd[20048]: warning: unknown[23.97.134.64]: SASL LOGIN authentication failed: authentication failure May 27 19:24:59 31337 postfix/smtps/smtpd[20048]: warning: unknown[23.97.216.188]: SASL LOGIN authentication failed: authentication failure May 27 19:25:00 31337 postfix/smtps/smtpd[20064]: warning: unknown[23.97.134.64]: SASL LOGIN authentication failed: authentication failure May 27 19:25:26 31337 postfix/smtps/smtpd[20048]: warning: unknown[23.97.134.64]: SASL LOGIN authentication failed: authentication failure May 27 19:25:50 31337 postfix/smtps/smtpd[20064]: warning: unknown[23.97.134.64]: SASL LOGIN authentication failed: authentication failure May 27 19:25:52 31337 postfix/smtps/smtpd[20048]: warning: unknown[23.97.216.188]: SASL LOGIN authentication failed: authentication failure .... May 28 09:00:19 31337 postfix/smtps/smtpd[30240]: warning: unknown[23.97.134.64]: SASL LOGIN authentication failed: authentication failure May 28 09:00:52 31337 postfix/smtps/smtpd[30240]: warning: unknown[23.97.134.64]: SASL LOGIN authentication failed: authentication failure May 28 09:01:17 31337 postfix/smtps/smtpd[30240]: warning: unknown[23.97.134.64]: SASL LOGIN authentication failed: authentication failure May 28 09:04:42 31337 postfix/smtps/smtpd[30240]: connect from unknown[23.97.134.64] May 28 09:04:46 31337 postfix/smtps/smtpd[30240]: warning: unknown[23.97.134.64]: SASL LOGIN authentication failed: authentication failure May 28 09:04:48 31337 postfix/smtps/smtpd[30240]: lost connection after AUTH from unknown[23.97.134.64] May 28 09:04:48 31337 postfix/smtps/smtpd[30240]: disconnect from unknown[23.97.134.64]
如果通过“微软”，你的意思是租用Azure虚拟机的人：那么也许。
此范围属于Microsoft，由Azure使用（请参阅： http : //www.microsoft.com/en-us/download/details.aspx?id=41653 ）。
所以这可能是几乎任何人。
您可能需要联系微软滥用部门。
或者像其他公共服务背景噪声那样忽略它。