I can't receive mail from zabbix alert

[zy1011]

This is my config:

1) I can send mail with the command like 'echo "Zabbix test" | mailx -v -s "test" [email protected]' from the zabbix server , with the "zabbix" user.
2) I edit my zabbix_server.conf, I'm sure the AlertScriptsPath is right and its group and user are also 'zabbix'
3) This is my script 'sendmail.sh':
#!/bin/bash
messages=`echo $3 | tr '\r\n' '\n'`
subject=`echo $2 | tr '\r\n' '\n'`
echo "${messages}" | mail -s "${subject}" $1 >>/tmp/sendmail.log 2>&1
4) I create media type with the type 'script', its name is 'sendmail.sh', its parameters are '{ALERT.SENDTO}','{ALERT.SUBJECT}','{ALERT.MESSAGE }'.
5) add user's (admin) media type.
6) edit configuration->actions -> action, condition is 'trigger severity >= warning'
7) edit configuration->actions -> operations: send message to users: Admin (Zabbix Administrator) via all media
8) edit configuration->actions -> recovery operations: send message to users: Admin (Zabbix Administrator) via all media

When I stopped one of zabbix-agent, reports -> action log remind me that mail's status is "sent", but in fact I can't receive any mail.

[Atsushi]

What is the detailed version of Zabbix you are using?
If it is 3.0 or later, did you add parameters in the media settings?
Can you send mail when you run the script manually?

[zy1011]

Thank you very much for your reply.
1）
zabbix_server (Zabbix) 3.2.11
Revision 76339 27 December 2017, compilation time: Dec 27 2017 10:12:08
2）Add parameters as the attachments
3）Yes, I can send mail manually.

[zy1011]

still need help...