Hi, I know mAPIRecipient is the indicator for using MAPI Rich Text Format. But what is the impact if I set to fasle or true? boteasy.

HI Boteasy, mAPIRecipient = False means it is a contact, not a domain user and doesn't have mailbox. mAPIRecipient = True means it is a domain user and has mailbox.

Hi, I have searched the internet and found the definition of mapirecipient: http://technet.microsoft.com/en-us/library/aa997320(EXCHG.65).aspx ADU&C location Attribute Description Exchange Advanced tab mAPIRecipient Use MAPI Rich Text Format (RTF) Any idea? boteasy.

Hi Boteasy, If you see in the link that this setting applies on Mail-Enabled User, inetOrgPerson, or Contact object. By default, mAPIRecipient set to False for contact and Mail-Enabled users. If you set it true then exchange sends message in reach text format instead for plain text. If you make it true/enable it then you need to make sure that remote domain can handle rich text formatted message otherwise settingsof remote email system take precedence.