Outlook Web App replies to the wrong email address when an email has more than 12 recipients in Exchange Server 2013

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Symptoms

Assume that there's an email that has more than 12 recipients in a Microsoft Exchange Server 2013 environment. In this message, the email header contains an email address that contains the "from" attribute and an email address that contains the "reply-to" attribute of the sender's actual email address. When you select the Reply button in Microsoft Outlook Web App, the "from" address replaces the "reply-to" address to be displayed as the sender's address in the From field of the reply email.

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Cause

This issue occurs because the mail compose component switches subsequent function calls when an email has many recipients. The subsequent function calls cause the Reply-To property to be omitted. Therefore, the "from" email address is populated as the sender's address.

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