MS-Exchange - SMTP Error: Could not connect to SMTP host

Hello,

Email alerting is not working when configured with SMTP/TLS.
I am getting following error SMTP Error: Could not connect to SMTP host

We have internal ms exchange server 2010

here is full configuration of Email Options
From name : Network Monitoring
From email address: [email protected] com
How to deliver mail: SMTP
SMTP SERVER: 10.10.10.10
SMTP port setting: 25
SMTP timeout setting: 10
Encryption: TLS
Auto TLS support: False
SMTP authentication: Enabled
SMTP Auth Username: [email protected]
SMTP Auth Password: ****

I can verify that 25 port is reachable to exchange server and username/password is correct.

with Encryption disabled and Authentication enabled I am getting SMTP Error: Could not authenticate

I have found similar problem on github, but unable to make same modification in functions.php because there is not SMTP Section in my case. https://github.com/librenms/librenms/issues/12991

is it possible to debug following issue to see more details what is causing error ?

./validate.php

Component Version
LibreNMS 21.10.0-50-gb0e0d65c8
DB Schema 2021_10_20_224207_increase_length_of_attrib_type_column (224)
PHP 7.4.3
Python 3.8.10
MySQL 10.3.31-MariaDB-0ubuntu0.20.04.1
RRDTool 1.7.2
SNMP NET-SNMP 5.8

====================================

[OK] Composer Version: 2.1.6
[OK] Dependencies up-to-date.
[OK] Database connection successful
[OK] Database schema correct

issue was resolved by changing IP address with domain name in SMTP SERVER:.

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