Keep received EHLO request from Jira

[Danny Kwok]

Recently, config a new SMTP server on Jira, checked from SMTP server log, find many "EHLO" request from Jira(2~3 requests per min), I want to know what happen.

Sample log:

"discarding EHLO keywords: CHUNKING"

"disconnect from xxx[1.2.3.4] ehlo=1 noop=1 quit=1 commands=3"

Attached the image of the log