Features, and the following line explains whether its already in Domino, or feasible using simple amendents to the IBM Mail template (that you own, for all times) :

Integrates with Microsoft Outlook 2013, Outlook 2010 and Outlook 2007.

        Domino 9 supports this, if you have a co-existing Notes and Exchange environment.

Available in 32 bit and 64 bit Supports HTML and Plain Text formats.

        Domino 9 supports this. One can even support Unix, Linux and Mac platforms too.

Alerts users when the Reply All button is selected.

        Domino 9 supports this, if you customize the Mail template yourself, using Domino Designer

Warns users that the message has a blank Subject line.

        Domino 9 supports this, if you customize the Mail template yourself, using Domino Designer

Prompts the user when external recipients are detected.

        Domino 9 supports this, if you customize the Mail template yourself, using Domino Designer

Confirms with the e-mail sender if they'd like to continue sending the message.

        Domino 9 supports this, if you customize the Mail template yourself, using Domino Designer

Prompts when the e-mail is addressed to a Distribution Lists.

        Domino 9 supports this (delayed response, not a prompt). See: IBM Domino Administrator 9.0.1 Social Edition Help - Customizing message transfer

Alerts users when recipient(s) are detected in the BCC field.

        Domino 9 supports this, if you customize the Mail template yourself, using Domino Designer

BCC disclosure inserts text into the recipients' message, thus notifying them of the BCC status.

        I believe Domino 9 supports this. See: IBM Domino Administrator 9.0.1 Social Edition Help - Setting up and using message disclaimers

Customize warnings when specific recipient addresses are detected.

        Domino 9 supports this, if you customize the Mail template yourself, using Domino Designer

Automatically add a Marketing, Circular 230 Disclosure, SEC, SPAM warnings and security disclaimers to e-mail messages.

        Domino 9 supports this. See: IBM Domino Administrator 9.0.1 Social Edition Help - Setting up and using message disclaimers

Warn for missing attachments. (New)

        Imprecise feature ! Does this mean you have a link (to a Document) enclosed but you want to ensure the entire document being linked to, is included ?

Alert for specific email attachment types, including document links attached to the email from a document management system. (New)

        Domino 9 supports this. See: IBM Domino Administrator 9.0.1 Social Edition Help - Controlling messaging

Warn when specific text is detected in the subject line. (New)

        Domino 9 supports this. See: IBM Domino Administrator 9.0.1 Social Edition Help - Setting server mail rules

Will look into help on certain topics. Yes, most of them are DIY in mail template.