增加下面几行，指定smtp服务器和发件发件账号
vim /etc/mail.rc
set from=testxxxx@xxxwm.com
set smtp=smtp.xxxwm.com
set smtp-auth=login
set smtp-auth-user=test_app
set smtp-auth-password=Xxxxxxx
启动postfix服务
#postfix start
发件测试：
[root@docker-41 data]# echo “hello, APP” | mail -s “HELLO , APP” qxxxxxg@xxxwm.com
[root@docker-41 data]# smtp-server: 535 5.7.8 Error: authentication failed: authentication failure
“/root/dead.letter” 11/316
. . . message not sent.
yum -y install cyrus-sasl-md5 cyrus-sasl-lib cyrus-sasl-plain cyrus-sasl cyrus-sasl-devel
[root@docker-41 data]# service saslauthd start
Redirecting to /bin/systemctl start saslauthd.service
再次测试：
[root@docker-41 data]# echo “hello, APP” | mail -v -s “HELLO , APP” qixxxx@xxxwm.com
Resolving host smtp.xxxwm.com . . . done.
Connecting to 139.xxx.xxx.63:smtp . . . connected.
220 Welcome to our mail.xxxwm.com SMTP
>>> EHLO docker-41
250-mail.xxxwm.com
250-PIPELINING
250-SIZE 100000000
250-ETRN
250-AUTH PLAIN LOGIN
250-AUTH=PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
>>> AUTH LOGIN
334 VXNlcm5hbWU6
>>> dGVzdF9hcHA=
334 UGFzc3dvcmQ6
>>> Q203OEx5bjhBUFA=
535 5.7.8 Error: authentication failed: authentication failure
smtp-server: 535 5.7.8 Error: authentication failed: authentication failure
“/root/dead.letter” 11/316
. . . message not sent.
在别的机器测试：成功！
[qxxxx@VM_12_17_centos ~]$ echo “hello, APP” | mail -v -s “HELLO , APP” qxxxx@xxxwm.com
Resolving host smtp.puyiwm.com . . . done.
Connecting to 139.199.149.63:smtp . . . connected.
220 Welcome to our mail.xxxwm.com SMTP
>>> EHLO VM_12_17_centos
250-mail.xxxwm.com
250-PIPELINING
250-SIZE 100000000
250-ETRN
250-AUTH PLAIN LOGIN
250-AUTH=PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
>>> AUTH LOGIN
334 VXNlcm5hbWU6
>>> bmFnaW9z
334 UGFzc3dvcmQ6
>>> Q203OEx5bjhRRw==
235 2.7.0 Authentication successful
>>> MAIL FROM:<nagxxxxx@xxxwm.com>
250 2.1.0 Ok
>>> RCPT TO:<qxxxxx@xxxwm.com>
250 2.1.5 Ok
>>> DATA
354 End data with <CR><LF>.<CR><LF>
>>> .
250 2.0.0 Ok: queued as 006F762FA
>>> QUIT
221 2.0.0 Bye
应该不是sasl的问题，换了别的账号就能发，新建的账号发不了
有空再研究，先用旧的账号吧
10.2.2.41