smtp relay is not sending emails internally

[HarikrishnanK]

Dear Team,Emails are triggered from our Application HP Process Automation 7.5. The SMTP server address configured in the application as localhost. We have SMTP Relay configured under Windows Server 2012 R2 under IIS. Mails triggered by the application is able to send mails to outside domains. We are using domain as [mycompanyname.in]. The mails sent to inside our domain is not delivering. ie, the SMTP relay server is able to send the mails to email ids such as *** Email address is removed for privacy ***, but it is not able to deliver the message to email ids such as *** Email address is removed for privacy *** SMTP Server ip configur

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