What is different between reply email and new email send ?

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I doing contact system web application using c sharp asp.net
using library mail kit
the problem is when some one reply to my email from outlook 2010 to any email I sent it then on my web application reply id on debug show null when receiving .
so How any email server like google,Microsoft know that email reached to inbox is new mail or reply for email ?
I already loop for inbox and get emails then show it
How email inbox message reached recognize that received message is new mail message or reply to mail sent before ?

if i test send or reply for any message using outlook it not have any problem
also send receiving and reply work good
problem on my web application asp.net receiving reply to email for second time .
I need any way solve my problem on web application .

What I have tried:

receiving emails not recognized on my inbox web application if reply or new message
using mail kit library .
How to solve prblem

Posted 16-Dec-19 14:44pm

ahmed_sa

Updated 17-Dec-19 1:50am

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MadMyche · Answer 1 · 2019-12-17T01:51:00

Solution 1

Without the actual code it is hard to understand exactly how you are attempting to reply to an email. I would suggest that you read through the Answers to this S/O question:
c# - Reply to a Mail in Mailkit - Stack Overflow[^]

Posted 17-Dec-19 1:51am

MadMyche