'selinux' not supported in vagrant VM

chcon -R -t httpd_sys_content_t vagrant

$ mount /dev/sda2 /vagrant/ -o defcontext="system_u:object_r:httpd_sys_content_t:s0"

apache

mount server:/export /vagrant -o context="system_u:object_r:httpd_sys_content_t:s0"

https://github.com/hashicorp/vagrant/issues/6970

QQ mail: 550 Suspected spam ip

qq mail: 550 Suspected spam ip
mail blocked by theIP

http://service.mail.qq.com/cgi-bin/help?subtype=1&&id=20022&&no=1001495
550 Suspected spam ip.
IP 发送大量垃圾邮件，或所发送的邮件收件人存在大量的不存在账号。

Basically It is nothing Service Provide can do, need user to set mail setting.

Solution:
Add domain into whitelist.
Setting》Spam》Set Email whitelist
Setting》Spam》Set domain whitelist
把被拒邮箱的网域加入白名单。
设置》反垃圾》设置邮件地址白名单
设置》反垃圾》设置域名白名单

iPhone Gmail App's 102kb e-mail size limit

Open an email in Gmail app with your iPhone, if the email size is over 102kb, you will find the mail is been clipped.

If you use web gmail, you can find a link named "View entire message".

By the way, you can have attachments be sent by email under 25M.

To avoid this issue:

Only send relevant information, use links to additional information.

Minimize your code, delete useless css style.

Preview before send.