EMAIL queue is growing and probe restarts every 20 minutes

Document ID : KB000113418
Last Modified Date : 10/09/2018
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Issue:
EMAIL queue is growing.
No emails are sent via emailgtw probe.
PID of emailgtw probe is changing every 20 minutes.
 
Environment:
emailgtw probe ANY version
Cause:
SMTP server was unable to respond to emailgtw probe's request.
emailgtw probe shutdown itself when there is no response from SMTP server.
Here are probe logs.

00:06:47:347 emailgtw: (send_it) smtp_open succeeded
00:06:47:347 emailgtw: RSET
00:06:47:347 emailgtw: 250 2.0.0 Ok
00:06:47:347 emailgtw: MAIL FROM:<emailgtw@test.local>
00:06:47:348 emailgtw: 250 2.1.0 Ok
00:06:47:348 emailgtw: RCPT TO:<user01@test.local>
00:25:53:587 emailgtw: signal 0 received, terminating ...
00:26:00:457 emailgtw: **********[ Starting Emailgtw ]***********
00:26:00:457 emailgtw: emailgtw 2.84
00:26:00:457 emailgtw: Nimsoft Corp.

 
Resolution:
Investigate SMTP server side problem.
This is an external website explains how to manually test connection to SMTP server.
https://support.microsoft.com/en-in/help/153119/xfor-telnet-to-port-25-to-test-smtp-communication