Fix SMTP values in settings on server restart

It addresses issue with SMTP_* setting value, which were overwritten by values from env on server restart and also, removed default value of SMTP_HOST and SMTP_PORT, which were also causing the same issue.

.env.example

@@ -300,8 +300,8 @@
 ###############################################################################
 # The SMTP server hostname.
 # Type:    string
-# Default: localhost
-# SMTP_HOST=localhost
+# Default: <no value>
+# SMTP_HOST=<no value>
 
 ###############################################################################
 # The SMTP post.

app/boot_levels.go

@@ -806,11 +806,13 @@ func applySmtpOptionsToSettings(ctx context.Context, log *zap.Logger, opt option
 			log.Warn(
 				"Environmental variables (SMTP_*) and SMTP settings " +
 					"(most likely changed via admin console) are not the same. " +
-					"When server was restarted, values from environmental" +
+					"When server was restarted, values from environmental " +
 					"variables were copied to settings for easier management. " +
 					"To avoid confusion and potential issues, we suggest you to " +
 					"remove all SMTP_* variables")
 		}
+
+		return
 	}
 
 	// SMTP server settings do not exist but

app/options/SMTP.cue

@@ -21,12 +21,10 @@ SMTP: schema.#optionsGroup & {
 
 	options: {
 		host: {
-			defaultValue: "localhost"
 			description:  "The SMTP server hostname."
 		}
 		port: {
 			type:          "int"
-			defaultGoExpr: "25"
 			description:   "The SMTP post."
 		}
 		user: {

pkg/options/options.gen.go

@@ -430,10 +430,7 @@ func SCIM() (o *SCIMOpt) {
 //
 // This function is auto-generated
 func SMTP() (o *SMTPOpt) {
-	o = &SMTPOpt{
-		Host: "localhost",
-		Port: 25,
-	}
+	o = &SMTPOpt{}
 
 	// Custom defaults
 	func(o interface{}) {