Hi Chandu,
Also in the past, the BTF Editor (UI Tag "BTF") has been used as IC Mail Editor. It has been used since CRM 2007. To use the parameters I have mentioned, just see preequisites from SAP Note 1921115. You do not need to use the new editor to use these parameter..
Some additional informatio for clarification: with SAP Improvement Notes 2116845 a new editor - often called Rich Text Editor has been introduced. Although it introduces a new UI Tag rteMCE, it is not directly included in the mail view CRMCMP_CCS_EML/MailBody. Here you still find the UI Tag BTF.
Nevertheless, if you activate the business function, then a delegation takes place on the WebUI layer. Instead of the used UI Tag BTF, the new UI tag rteMCE is used.
Both editors are part of BSP Extension THTMLBX.
Best Regards,
Sigrid