本篇内容介绍了“Centos发邮件遇到的问题怎么解决”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！

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网易163免费邮箱相关服务器信息：

一、安装和配置:

1.1、安装

[root@linux-node2 ~]# yum install mailx -y

loaded plugins: fastestmirror, security

setting up install process

determining fastest mirrors

 * base: mirrors.aliyun.com

 * extras: mirrors.aliyun.com

 * updates: mirrors.aliyun.com

base            | 3.7 kb  00:00  

epel            | 3.2 kb  00:00  

epel/primary           | 3.2 mb  00:00  

epel              12521/12521

extras            | 3.4 kb  00:00  

icehouse           | 2.9 kb  00:00

updates            | 3.4 kb  00:00  

updates/primary_          | 1.2 mb  00:00  

package mailx-12.4-8.el6_6.x86_64 already installed and latest version

nothing to do

1.2、配置(以163邮箱为例)

首先你的邮箱要支持你的需求，到邮箱里去配置

 

然后到/etc/mail.rc的配置文件中去添加

set from=admin@163.com smtp=smtp.163.com smtp-auth-user=admin smtp-auth-password=xxxxxx  smtp-auth=login

[root@linux-node2 ~]# echo “12345” | mail -v -s “test”

至此应该是没问题，但是就是收不到邮件。得了，开始排错！所有的网络、配置检查完成后，还是收不到邮件，最后检查到端口发现问题！！！

[root@linux-node2 ~]# telnet smtp.163.com 25

trying 220.181.12.17...

^c

[root@orcherstrator ~]# nc -vz -w 1 smtp.163.com 25

nc: connect to smtp.163.com port 25 (tcp) timed out: operation now in progress

nc: connect to smtp.163.com port 25 (tcp) timed out: operation now in progress

nc: connect to smtp.163.com port 25 (tcp) timed out: operation now in progress

nc: connect to smtp.163.com port 25 (tcp) timed out: operation now in progress

nc: connect to smtp.163.com port 25 (tcp) timed out: operation now in progress

nc: connect to smtp.163.com port 25 (tcp) timed out: operation now in progress

nc: connect to smtp.163.com port 25 (tcp) timed out: operation now in progress

nc: connect to smtp.163.com port 25 (tcp) timed out: operation now in progress

原来服务器根本就不能和第三方邮箱建立连接，问题找到，开始处理，一查才知道阿里云服务器把25端口给封了，需要申请解封。好吧！登录管理控制台，开始申请！！！

阿里云的审核速度还挺快的，两个多小时后反馈结果了，不过看看就吐口老血！！！

只能想其他的办法呗！！最后决定使用163邮箱的465加密端口

[root@orcherstrator ~]# telnet smtp.163.com 465

trying 220.181.12.14...

connected to smtp.163.com.

escape character is '^]'.

^c

connection closed by foreign host.

root@orcherstrator ~]# nc -vz -w 1 smtp.163.com 465

connection to smtp.163.com 465 port [tcp/urd] succeeded!

看样子有戏哦！！！修改/etc/mail.rc的配置

set from=admin@163.com

set smtp="smtps://smtp.163.com:465"

set smtp-auth-user=admin@163.com

set smtp-auth-password=xxxxx

set smtp-auth=login

set smtp-use-starttls

set ssl-verify=ignore

set nss-config-dir=/etc/pki/nssdb/

[root@linux-node2 ~]# echo 'hello' |mail -v -s "test" yueyuancun@163.com

resolving host smtp.163.com . . . done.

connecting to 123.125.50.133 . . . connected.

error in certificate: peer's certificate issuer is not recognized. ##没有对端的证书

comparing dns name: "*.163.com"

ssl parameters: cipher=aes-128-gcm, keysize=128, secretkeysize=128,

issuer=cn=geotrust ssl ca - g3,o=geotrust inc.,c=us

subject=cn=*.163.com,o="netease (hangzhou) network co., ltd",l=hangzhou,st=zhejiang,c=cn

220 163.com anti-spam gt for coremail system (163com[20141201])

>>> ehlo linux-node2

250-mail

250-pipelining

250-auth login plain

250-auth=login plain

250-coremail 1uxr2xkj7kg0xki17xgru7i0s8fy2u3uj8cz28x1uuuuu7ic2i0y2ufvhs-cuca0xdruuuuj

250-starttls

250 8bitmime

>>> auth login

334 dxnlcm5hbwu6

>>> exvlexvhbmn1bkaxnjmuy29t

334 ugfzc3dvcmq6

>>> agvsbg9uawhhbze5odkxma==

535 error: authentication failed

smtp-server: 535 error: authentication failed

"/root/dead.letter" 11/299

. . . message not sent. ##邮件没有发出去

至此，网上的case都说能收到邮件，但是我这就是收不到，那就根据错误来解决呗！！！搞证书

[root@linux-node2 ~]# mkdir -p /root/.certs/

[root@linux-node2 ~]# echo -n | openssl s_client -connect smtp.163.com:465 | sed -ne '/-begin certificate-/,/-end certificate-/p' > ~/.certs/163.crt

depth=2 c = us, o = geotrust inc., cn = geotrust global ca

verify return:1

depth=1 c = us, o = geotrust inc., cn = geotrust ssl ca - g3

verify return:1

depth=0 c = cn, st = zhejiang, l = hangzhou, o = "netease (hangzhou) network co., ltd", cn = *.163.com

verify return:1

done

[root@linux-node2 ~]# certutil -a -n "geotrust ssl ca" -t "c,," -d ~/.certs -i ~/.certs/163.crt

[root@linux-node2 ~]# certutil -a -n "geotrust global ca" -t "c,," -d ~/.certs -i ~/.certs/163.crt

[root@linux-node2 ~]# certutil -l -d /root/.certs

certificate nickname                                      trust attributes

                                                   ssl,s/mime,jar/xpi

geotrust ssl ca                                          c,,

[root@linux-node2 ~]# cd /root/.certs/

[root@linux-node2 .certs]# certutil -a -n "geotrust ssl ca - g3" -t "pu,pu,pu"  -d ./ -i 163.crt

notice: trust flag u is set automatically if the private key is present.

[root@linux-node2 .certs]# cd

[root@linux-node2 ~]# vim /etc/mail.rc

set from=admin@163.com

set smtp="smtps://smtp.163.com:465"

set smtp-auth-user=admin@163.com

set smtp-auth-password=xxxxx

set smtp-auth=login

set smtp-use-starttls

set ssl-verify=ignore

set nss-config-dir=/root/.certs

[root@linux-node2 ~]# echo 'hello' |mail -v -s "test" admin@163.com

resolving host smtp.163.com . . . done.

connecting to 123.125.50.132 . . . connected.

comparing dns name: "*.163.com"

ssl parameters: cipher=aes-128-gcm, keysize=128, secretkeysize=128,

issuer=cn=geotrust ssl ca - g3,o=geotrust inc.,c=us

subject=cn=*.163.com,o="netease (hangzhou) network co., ltd",l=hangzhou,st=zhejiang,c=cn

220 163.com anti-spam gt for coremail system (163com[20141201])

>>> ehlo linux-node2

250-mail

250-pipelining

250-auth login plain

250-auth=login plain

250-coremail 1uxr2xkj7kg0xki17xgru7i0s8fy2u3uj8cz28x1uuuuu7ic2i0y2uf6b612uca0xdruuuuj

250-starttls

250 8bitmime

>>> auth login

334 dxnlcm5hbwu6

>>> exvlexvhbmn1bkaxnjmuy29t

334 ugfzc3dvcmq6

>>> agvsbg9uawhhbze5odk=

235 authentication successful

>>> mail from:

250 mail ok

>>> rcpt to:

250 mail ok

>>> data

354 end data with .

>>> .

250 mail ok queued as smtp2,dngowadh53ejp5bbgyuhaa--.2s2 1536206732

>>> quit

221 bye

终于成功了！！！！

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