I want create one notify html with long text in rule mail of office365 .but when i create block message and notify but this then limit long text . please guide help me how to can notify user with long text
Define long? There's a maximum length of 8k chars per rule, although individual parameters might be limited to less. A quick test with the RejectMessageReasonText one shows it works fine with 800+ chars message, so you should have enough room? It also allows for basic HTML elements.