Zabbix SMTP Authentication on Exchange

Zabbix 3.0.2 On Exchange there is a separate "receive connector" with "Basic authentication" enabled. In the Zabbix notification method settings, specify the username WITHOUT the domain name.

Let's verify:

root@v11:~# telnet mail.domain.com 25
Trying 192.168.112.59...
Connected to mail.domain.com .
Escape character is '^]'.
220 mail.domain.com Microsoft ESMTP MAIL Service ready at Tue, 17 May 2016 15:25:25 +0300
EHLO test.domain.local
250-mail.domain.com Hello [192.168.112.61]
250-SIZE
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-AUTH LOGIN
250-8BITMIME
250-BINARYMIME
250 CHUNKING
AUTH LOGIN
334 VXNlcm5hbWU6
MWluY3phYmJpeA==
334 UGFzc3dvcmQ6
WmFiaXgxNg==
235 2.7.0 Authentication successful