Scalable Link Outreach with Gmail and Boomerang

Sometimes it's the little things in life….Boomerang for Gmail (and Outlook) is an incredibly useful, lightweight, powerful link outreach app.
Link building has a special place in the SEO industry. Beyond being one of the harder skill-sets to master and acquire, link building is likely the most important element of an SEO campaign.
Link building can also be the most difficult job to:
Scale internally and externally
Train someone to do efficiently
Outsource
Hire someone for
How to hire link builders and how to train them are certainly worthy of their own (upcoming) blog posts but this post is going to sing the praises of a Gmail and Outlook plugin that is essential for my link building workflow.
Boomerang for Gmail (and Outlook)
Outside of the really cool name this plugin makes my workflow much more streamlined and efficient.
I don't use Outlook so I'll be focusing on the Gmail plug-in here. The Outlook plugin has most of the functionality of the Gmail edition (minus the Send On options) and you can check out the Outlook version here.
The key benefits to using Boomerang (referencing the Gmail app going forward) are:
Schedule emails to be sent at a later date/time
Set reminders on emails so they pop back up at a specified time
Set email reminders from your smartphone
Send Emails Later
You can install Boomerang for Gmail here. You can use this for Gmail and Google apps and you'll need to use Firefox or Chrome.
You'll manage Boomerang in two places; you can get to it in your Gmail toolbar:

From here you can access your scheduled messages to make any changes and access various help and how-to's.
The other area where you access Boomerang is in the email dialogue box. When you go to compose a new message or click to reply to one you'll see the Boomerang button and see all the options available for sending the message:

If you click on anything other than the specific time option at the bottom, the message is scheduled straight away.
If you need to access y