Incoming email - sharepoint 2016

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SharePoint2010

SharePoint2013

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Hi,

I have a domain "xxx.edu.in" being configured successfully in Exchange server. I need to send email to SharePoint document library where the email address will be "doclib@xxx.edu.in". I configured domain "xxx.edu.in" in Central Admin and then tried sending the email. There wasn't any Undeliverable message from outlook which clearly states that settings configured on Exchange is perfect.

I noticed that the default domain in IIS 6.0 SMTP is different (YYY.shared-svc.local). I understand that I may need to add "XXX.edu.in" in IIS 6.0 SMTP domain to successfully recieve email in SharePoint.

I am planning to add the domain("XXX.edu.in") in IIS SMTP as alias domain , so that i can successfully receive incoming email in SharePoint. Is it advisable to add more than 1 domain in IIS SMTP other than the servername. Will this cause any issue to outgoing email settings , which is working fine ?

What I have tried:

Added successfully the Exchange configuration , CA settings , Doclib settings for Incoming Email