Why my Contact Form 7 form is not working - wordpress

Question

I am running the latest version of contact form 7 on my site and all of the forms are working flawlessly except one. I keep getting the message "Failed to send your message.
Please try later or contact the administrator by another method." I haven't come across any errors in the console and have tried everything from deleting the entire plugin and re-entering all the forms to deleting and recreating the problem form. I have tried all the troubleshooting suggestions I could find.
I am at a complete loss if anyone has any suggestions it would be incredibly helpful.
The form is located at: http://test.drummerrealty.com/management-services/#inquiries.
Here is the code:
Form:
Contact Information
<div class="row">
<div class="col-md-3 col-sm-12">
<p>First Name *<br />
[text* first-name] </p>
<p>Last Name *<br />
[text* last-name] </p>
</div>
<div class="col-md-3 col-sm-12">
<p>Your Email *<br />
[email* your-email] </p>
<p>Telephone *<br />
[tel* tel-819]</p>
</div>
<div class="col-md-3 col-sm-12">
<p>Property Address<br />
[text address]</p>
<p>City<br />
[text city]</p>
</div>
<div class="col-md-3 col-sm-12">
<p>Province<br />
[text province]</p>
<p>Postal Code<br />
[text postal-code]</p>
</div>
<h3>Property Information</h3>
<div class="row">
<div class="col-md-6 col-sm-12">
<p>Property Class:<br />
[select property use_label_element "Condominium" "Townhome" "Single Family Dwelling" "Apartment Block"]</p>
<p>Year Built<br />
[number build-year min:1900 max:3500]</p>
<p>Number of Bedrooms:<br />
[select num-bed "1" "2" "3" "4" "5+"]</p>
<p>Number of Bathrooms:<br />
[select num-bath "1" "1.5" "2" "2.5" "3" "3.5" "4" "4.5" "5+"]</p>
<p>When do you plan to lease this property? (yyyy-mm-dd)<br />
[date date-lease] </p>
</div>
<div class="col-md-6 col-sm-12">
<p>Style & Features<br />
[checkbox features use_label_element "Bungalow" "2-storey" "Apartment" "Walk-out Basement" "Gated Community" "Parking " "Attached Garage" "Detached Garage"]</p>
<p>Square Footage<br />
[number sq-foot]</p>
</div>
<div class="row">
<div class="col-sm-12">
<p>Additional Details<br />
[textarea add-details] </p>
<p>[submit "Send"]</p>
</div>
Mail:
From: [first-name] [last-name]
Subject: Property Management form from [first-name] [last-name]
Message body:
Contact Information
First Name: [first-name]
Last Name: [last-name]
Your Email: [your-email]
Telephone: [tel-819]
Property Address: [address]
City: [city]
Province: [province]
Postal Code: [postal-code]
Property Information
Property Class: [property]
Style & Features: [features]
Square Footage: [sq-foot]
Year Built: [build-year]
Number of Bedrooms: [num-bed]
Number of Bathrooms: [num-bath]
When do you plan to lease this property?: [date-lease]
Additional Details: [add-details]