diff --git a/install/data/defaults.json b/install/data/defaults.json
index a86fa023e4..43dd55bcc6 100644
--- a/install/data/defaults.json
+++ b/install/data/defaults.json
@@ -147,6 +147,7 @@
     "username:disableEdit": 0,
     "email:disableEdit": 0,
     "email:smtpTransport:pool": 0,
+    "email:smtpTransport:allow-self-signed": 0,
     "hideFullname": 0,
     "hideEmail": 0,
     "showFullnameAsDisplayName": 0,
diff --git a/public/language/en-GB/admin/settings/email.json b/public/language/en-GB/admin/settings/email.json
index a3f49a0416..31d5a4f0fb 100644
--- a/public/language/en-GB/admin/settings/email.json
+++ b/public/language/en-GB/admin/settings/email.json
@@ -28,6 +28,8 @@
 	"smtp-transport.password": "Password",
 	"smtp-transport.pool": "Enable pooled connections",
 	"smtp-transport.pool-help": "Pooling connections prevents NodeBB from creating a new connection for every email. This option only applies if SMTP Transport is enabled.",
+	"smtp-transport.allow-self-signed": "Allow self-signed certificates",
+	"smtp-transport.allow-self-signed-help": "Enabling this setting will allow you to use self-self or invalid TLS certificates.",
 
 	"template": "Edit Email Template",
 	"template.select": "Select Email Template",
diff --git a/src/emailer.js b/src/emailer.js
index 6c57d6b44a..f280c21399 100644
--- a/src/emailer.js
+++ b/src/emailer.js
@@ -153,7 +153,11 @@ Emailer.setupFallbackTransport = (config) => {
 		} else {
 			smtpOptions.service = String(config['email:smtpTransport:service']);
 		}
-
+		if (config['email:smtpTransport:allow-self-signed']) {
+			smtpOptions.tls = {
+				rejectUnauthorized: false,
+			};
+		}
 		Emailer.transports.smtp = nodemailer.createTransport(smtpOptions);
 		Emailer.fallbackTransport = Emailer.transports.smtp;
 	} else {
diff --git a/src/views/admin/settings/email.tpl b/src/views/admin/settings/email.tpl
index a89fb850a8..d39d3b8f72 100644
--- a/src/views/admin/settings/email.tpl
+++ b/src/views/admin/settings/email.tpl
@@ -116,6 +116,11 @@
 					<label for="email:smtpTransport:pool" class="form-check-label">[[admin/settings/email:smtp-transport.pool]]</label>
 					<p class="form-text">[[admin/settings/email:smtp-transport.pool-help]]</p>
 				</div>
+				<div class="form-check form-switch mb-3">
+					<input class="form-check-input" type="checkbox" id="email:smtpTransport:allow-self-signed" data-field="email:smtpTransport:allow-self-signed" name="email:smtpTransport:allow-self-signed" />
+					<label for="email:smtpTransport:allow-self-signed" class="form-check-label">[[admin/settings/email:smtp-transport.allow-self-signed]]</label>
+					<p class="form-text">[[admin/settings/email:smtp-transport.allow-self-signed-help]]</p>
+				</div>
 				<div class="mb-3">
 					<label class="form-label" for="email:smtpTransport:service">[[admin/settings/email:smtp-transport.service]]</label>
 					<select class="form-select" id="email:smtpTransport:service" data-field="email:smtpTransport:service">