Hostus香港和悉尼数据中心是租用的Softlayer数据中心，而Softlayer数据中心将封掉25端口，很明显这会影响到发邮件。目前，Hostus发通知了将于2月1日开始实施。Hostus提醒使用香港VPS和悉尼VPS的朋友们，如何有向外发生邮件的，请尽快才用邮件中转的方式来解决这一问题，如Mandrill、SendGrid或MailGun。
Hostus官方原文如下：
Outbound SMTP Port 25 Changes
** This affects services located in Hong Kong and Sydney ONLY **
Starting 02/01/2016, SoftLayer will be implementing additional measures to stop malicious internet actors that look to the SoftLayer platform as a resource for them. One of the measures they are implementing is a traffic filter to block outbound TCP port 25, which will prevent your VPS instances from sending direct outbound email.
We ask that you review your systems and applications to determine if they are sending direct outbound email. Once these changes are implemented, your public IP address(es) will cease to have access to send traffic outbound via TCP port 25, and any direct email which is created by your systems will need to route through an SMTP relay (typically TCP port 587 or 465).
We recommend using one of the many SMTP relay services available, such as Mandrill, SendGrid and MailGun. For more information, please visit this link: http://blog.softlayer.com/2015/ongoing-actions-eliminate-spam-hosting
Monday, January 18, 2016
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