diff --git a/lib/Emailer.js b/lib/Emailer.js
index 9cf2087..7d43311 100644
--- a/lib/Emailer.js
+++ b/lib/Emailer.js
@@ -26,48 +26,48 @@ class EmailBuilder {
 	 * The subject of the email
 	 * @type {string}
 	 */
-	subject;
+	#subject;
 
 	/**
 	 * The plaintext body of the email
 	 * @type {string}
 	 */
-	body;
+	#body;
 
 	/**
 	 * The html body of the email
 	 * @type {string}
 	 */
-	HTMLBody;
+	#HTMLBody;
 
 	/**
 	 * The from address for the email
 	 * @type {string}
 	 */
-	from = 'Stratos <contact@stratos.com>';
+	#from = 'Stratos <stratos@heliumdev.uk>';
 
 	/**
 	 * The addresses to send to
 	 * @type {Array<string>}
 	 */
-	to;
+	#to;
 
 	/**
 	 * The addresses to carbon copy to
 	 * @type {Array<string>}
 	 */
-	cc;
+	#cc;
 
 	/**
 	 * The addresses to blind carbon copy to
 	 * @type {Array<string>}
 	 */
-	bcc;
+	#bcc;
 
 	constructor() {
-		this.to = [];
-		this.cc = [];
-		this.bcc = [];
+		this.#to = [];
+		this.#cc = [];
+		this.#bcc = [];
 	}
 
 	/**
@@ -76,7 +76,7 @@ class EmailBuilder {
 	 * @returns {EmailBuilder}
 	 */
 	setSubject(subject) {
-		this.subject = subject;
+		this.#subject = subject;
 		return this;
 	}
 
@@ -86,7 +86,7 @@ class EmailBuilder {
 	 * @returns {EmailBuilder}
 	 */
 	setBody(body) {
-		this.body = body;
+		this.#body = body;
 		return this;
 	}
 
@@ -96,7 +96,7 @@ class EmailBuilder {
 	 * @returns {EmailBuilder}
 	 */
 	setHTMLBody(HTMLBody) {
-		this.HTMLBody = HTMLBody;
+		this.#HTMLBody = HTMLBody;
 		return this;
 	}
 
@@ -106,7 +106,7 @@ class EmailBuilder {
 	 * @returns {EmailBuilder}
 	 */
 	setFrom(from) {
-		this.from = from;
+		this.#from = from;
 		return this;
 	}
 
@@ -116,8 +116,8 @@ class EmailBuilder {
 	 * @returns {EmailBuilder}
 	 */
 	addTo(addresses) {
-		const newAddresses = removeDupes(addresses, this.to);
-		this.to.push(...newAddresses);
+		const newAddresses = removeDupes(addresses, this.#to);
+		this.#to.push(...newAddresses);
 		return this;
 	}
 
@@ -127,7 +127,7 @@ class EmailBuilder {
 	 * @returns {EmailBuilder}
 	 */
 	removeTo(addresses) {
-		this.to = removeDupes(this.to, addresses);
+		this.#to = removeDupes(this.#to, addresses);
 		return this;
 	}
 
@@ -137,8 +137,8 @@ class EmailBuilder {
 	 * @returns {EmailBuilder}
 	 */
 	addCC(addresses) {
-		const newAddresses = removeDupes(addresses, this.to);
-		this.cc.push(...newAddresses);
+		const newAddresses = removeDupes(addresses, this.#to);
+		this.#cc.push(...newAddresses);
 		return this;
 	}
 
@@ -148,7 +148,7 @@ class EmailBuilder {
 	 * @returns {EmailBuilder}
 	 */
 	removeCC(addresses) {
-		this.cc = removeDupes(this.cc, addresses);
+		this.#cc = removeDupes(this.#cc, addresses);
 		return this;
 	}
 
@@ -158,8 +158,8 @@ class EmailBuilder {
 	 * @returns {EmailBuilder}
 	 */
 	addBCC(addresses) {
-		const newAddresses = removeDupes(addresses, this.to);
-		this.bcc.push(...newAddresses);
+		const newAddresses = removeDupes(addresses, this.#to);
+		this.#bcc.push(...newAddresses);
 		return this;
 	}
 
@@ -169,7 +169,7 @@ class EmailBuilder {
 	 * @returns {EmailBuilder}
 	 */
 	removeBCC(addresses) {
-		this.bcc = removeDupes(this.bcc, addresses);
+		this.#bcc = removeDupes(this.#bcc, addresses);
 		return this;
 	}
 }