2.2.5 [RFC3501] Section 2.3.4, [RFC2822] Size Message Attribute

V0006:

The specification defines the [RFC2822] size message attribute as the number of octets in the message.

Microsoft Exchange Server 2007, Microsoft Exchange Server 2010, Microsoft Exchange Server 2013, Microsoft Exchange Server 2016

By default, Microsoft Exchange Server calculates the [RFC2822] size based on the amount of storage space that the message actually occupies. However, Microsoft Exchange can be configured to base the calculation of the [RFC2822] size on the exact MIME size of the message.

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