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emails are not getting delivered from crm system to smtp server

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Last Modified: 2018-09-27
Dear Experts

We have configure CRM application system running on windows server R2, configure the application for outbound and inbound in the email settings section of application  but mails are not getting delivered from CRM system to SMTP server , log report attached, from the OS level when done telnet able to communicate to the mail server, can you please suggest where we might be going wrong and help us to fix this.
email-issue.txt
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Commented:
thanks for the reply,
1. did check from the OS though telnet it works perfectly with server and port details , did follow the link provided by you i,e test-smtp-with-telnet from Microsoft.
2. configured email account in the CRM system with SMTP mail server.
port:25
check marked "use SMTP Authentication".
provided user name and password
RESULT: is not able to send mail following popup from the CRM system
"Error Failed to connect to outbound SMTP Mail Server. The outbound mail server selected for the mail account you are using is invalid check the settings OR select different mail server"
OBSERVATION
1.   through the telnet mail can be sent and received but here noted there is no "Authentication process" involved
2. also when unchecked the "Use SMTP Authentication" that is disabled the SMTP Authentication then able to send mail out.
please let me know can I come to conclusion the issue the with the email account provided /configured does not get authenticated with SMTP server therefore this account not able to deliver email.

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