diff --git a/README.md b/README.md
index 4f59739..d529af9 100644
--- a/README.md
+++ b/README.md
@@ -3,8 +3,16 @@ ssh防止暴力破解,适用Debian 8、9、11 Centos 7
 支持钉钉告警和邮件告警  
 支持第三方QQ邮箱告警  
 支持一次运行检测、后台运行检测  
+
+```
 Debian系统请安装libcurl库和libiptc库  
-Centos 7系统请安装libcurl库和iptables-devel库，yum install iptables-devel libcurl-devel
+    apt install libip4tc-dev libcurl4-openssl-dev (或者libcurl4-gnutls-dev)  
+```
+
+```
+Centos 7系统请安装libcurl库和iptables-devel库  
+    yum install iptables-devel libcurl-devel  
+```
 
 
 ```
diff --git a/denyhosts.sh b/denyhosts.sh
index ed34431..32b7998 100644
--- a/denyhosts.sh
+++ b/denyhosts.sh
@@ -9,7 +9,7 @@
 source /etc/profile
 
 function init() {
-    SEND_MAIL=0
+    SEND_MAIL=1
     PWD_PATH="/root";
     TIME=`date +"%Y%m%d%H%M"`;
     LOG_FILE="${PWD_PATH}/${TIME}.log";
diff --git a/rhost.c b/rhost.c
index 42060fd..c59b472 100644
--- a/rhost.c
+++ b/rhost.c
@@ -97,7 +97,8 @@ int dingding_warning(char *illegal_ip, char *public_ip, conf *conf)
     strcpy(temp, public_ip);
     temp[strlen(public_ip)-1] = '\0';
     
-    if ((fp = fopen("libcurl_ding.log", "wt+")) == NULL){
+    if ((fp = fopen("libcurl_ding.log", "wt+")) == NULL)
+    {
         return 1;
     }
     
@@ -106,7 +107,8 @@ int dingding_warning(char *illegal_ip, char *public_ip, conf *conf)
 
     curl_global_init(CURL_GLOBAL_ALL);
     curl = curl_easy_init();
-    if (curl == NULL) {
+    if (curl == NULL)
+    {
         return 1;
     }
     
@@ -148,7 +150,7 @@ int dingding_warning(char *illegal_ip, char *public_ip, conf *conf)
 }
 
 // 邮件告警
-int mail_warning(char *illegal_ip, char *public_ip)
+int mail_warning(char *illegal_ip, char *public_ip, conf *conf)
 {
     FILE *fp = NULL;
     char buff[BUFFER];
@@ -162,15 +164,15 @@ int mail_warning(char *illegal_ip, char *public_ip)
     
     strcpy(temp, public_ip);
     temp[strlen(public_ip)-1] = '\0';
+    sprintf(text, "echo \"主机:%s, 禁止%s访问\" | mail -s \"System ban IP\" %s", temp, illegal_ip, conf->RECV_MAIL);
 
-    sprintf(text, "主机:%s, 禁止%s访问", temp, illegal_ip);
-    strcat(text, " mail -s \"System ban IP\" 1605227279@qq.com");
-
-    if (NULL == (fp = popen(text, "r"))) {
+    if (NULL == (fp = popen(text, "r")))
+    {
         perror("popen text");
     }
 
-    while (fgets(buff, BUFFER, fp) != NULL) {
+    while (fgets(buff, BUFFER, fp) != NULL)
+    {
         buff[strlen(buff) - 1] = '\0';
     }
 
@@ -196,12 +198,10 @@ int QQ_mail_warning(char *illegal_ip, char *public_ip, conf *conf)
     temp[strlen(public_ip)-1] = '\0';
     
     sprintf(text, "主机:%s, 禁止%s访问", temp, illegal_ip);
-    
     sprintf(string, QQMAIL, conf->RECV_MAIL, text);
-    printf("%s\n", string);
-    system(string);
+
     
-    return 0;
+    return system(string);
 }
 
 // 封禁非法IP
@@ -298,7 +298,7 @@ int rule(conf *conf)
             
             if (conf->IS_MAIL == 1)                         // 邮件告警
             {
-                mail_warning(buffer, public_ip);
+                mail_warning(buffer, public_ip, conf);
                 sleep(3);
             }