I don't agree with Salesloft. There are times that you don't need an unsubscribe, like emailing a potential client about contract revisions during negotiations, but generally when sales uses a tool to send emails, even if it's not "bulk" emails you want to include an unsubscribe.
Part of that is the increasing number of countries that are writing laws against SPAM (I know, you aren't SPAM. But SPAM is in the eye of the beholder and lots of people are going to think you are SPAM even when you aren't). Part of that is because I'd rather offer an opt out on an email than run the risk of being seen as a spammer and blacklisted (which is a pain and WILL impact your company's email server and ability to send ANY email, even just a one off "hey mom, work is boring" email, let alone an important "Dear CFO, I need more budget" or "Please digitally sign this contract and let's celebrate my HUGE commission" email).
In Canada, they regulate Commercial Electronic Messages, defined:
- is in an electronic format, including emails, instant messages, text messages, and some social media communications;
- is sent to an electronic address, including email addresses, instant message accounts, phone accounts, and social media accounts; and
- contains a message encouraging recipients to take part in some type of commercial activity, including the promotion of products, services, people/personas, companies, or organizations.
Notice that no where on there does it say "Bulk" or "mass" message. SPAM is no longer just mass mailing and You don't want to get fined under this law.
You should include an unsubscribe link in MSI. Period.