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邮件协议简称：
| SMTP |
simple mail transfer protocol |
| POP |
post office protocol |
| TLS |
transport layer security |
| SSL |
secure sockets layer |
| DNS |
domain name system |
| IMAP |
internet mail access protocol,邮件访问协议） |
| MAIL_SEVER |
FUWUQI IP/LOCALHOST |
| MAIL_PORT |
25 |
| MAIL_USE_TLS |
FALSE |
| MAIL_USE_SSL |
FALSE |
| MAIL_USERNAME |
NONE |
| MAIL_PASSWORD |
NONE |
