Since SmartMove is designed as a consumer initiated website, requiring the consumer to authenticate their identity online and give permissions to release their credit and criminal information prior to the information being released to a potential landlord..

If what you want to do doesn't require money or credit (As mentioned above) Have the knowledge of how to do it and go with the Nike slogan - "Just do it"!!!!

MY first instinct is of saying - Nike!!!

You recently sent email to a mailbox that requires authentication of the sender to reduce spam.

There are some really good looking fonts available that look nearly authentic.

how is it authenticated?

Leading providers of electronic signatures services offer advanced authentication methods, like linking a signature to a password-protected account and email address to prove who signed the document.

In the end, they are really investing in YOU, so make sure you are authentic, knowledgeable, and confident.BTW, the above assumes you are not talking about family offices, small funds, etc. 

My husband and I plan to begin our first direct mail campaign   I would strongly suggest you do not do DMM.Look into PPC/Facebook ads.There is a reason Nike, Apple Samsung, don't touch CC, D4$, DMM, Bandit signs.Look into other marketing venues, and then try to come up with reasons why any and all are bad.If you can't come up with a reason , then that is one you need to consider.There is nothing OK with DMM.

I make a real and authentic effort to incentivize them to take care of my properties and reach out if something isn't right.