Email is still a universal internet tool.
An online graphical process design tool with API support for many popular online tools (WordPress, Twitter, Facebook, etc.) The graphical interface will allow you to specify how to process an email (parsing, filtering, etc.) and what actions to trigger on the external tools and platforms.
Even though email is an asynchronous system by its nature, it might be useful to have a context of the urgency of reply. Something that is more precise than “low/normal/high priority.”
Use one digit number from 0 to 9 to specify the number of days until you would like to receive a reply. Start your subject line with this figure. Zero for today, one for tomorrow, etc.
Most subscribers never open your emails.
Insert the following (or similar) text at the end of your email’s short subject “Click here to get the gist of this quickly” and a link to the web page you are promoting in your email. When they click on the link directly from the subject line, they go to that page, but instead of seeing the page as a normal visitor sees it, they get an overlay window obscuring the underlying page, with a shorter version of the email (or the whole email if it’s short.) When they click on the CTA, they simply get to see the underlying page.
Try a new way to make the opt-in sequence convert better.
Let them read (by simply clicking) the first page of what you promise them in exchange for their email and only then ask them to opt in. This, of course, should sell the whole product you are giving them for free.
An experiment for a new way to get better conversions.
Instead of promising the visitor something in exchange for their email address (like a free report), simply promise them a personal connection with you – whenever they reply to an email you send them you will personally (or another human and not an automated system) always reply quickly.