Allow separate mailer account and From address

src/config/config.go.example

@@ -35,8 +35,9 @@ var Config = HMNConfig{
 		ServerAddress:       "smtp.example.com",
 		ServerPort:          587,
 		FromAddress:         "noreply@example.com",
-		FromAddressPassword: "",
 		FromName:            "Handmade Network Team",
+		MailerUsername:      "actualuser@example.com",
+		MailerPassword:      "",
 
 		ForceToAddress: "localdev@example.com", // NOTE(asaf): If this is not empty, all emails will be sent to this address.
 	},

src/config/types.go

@@ -60,12 +60,13 @@ type DigitalOceanConfig struct {
 }
 
 type EmailConfig struct {
-	ServerAddress       string
-	ServerPort          int
-	FromAddress         string
-	FromAddressPassword string
-	FromName            string
-	ForceToAddress      string
+	ServerAddress  string
+	ServerPort     int
+	FromAddress    string
+	MailerUsername string
+	MailerPassword string
+	FromName       string
+	ForceToAddress string
 }
 
 type DiscordConfig struct {

src/email/email.go

@@ -124,7 +124,7 @@ func sendMail(toAddress, toName, subject, contentHtml string) error {
 	)
 	return smtp.SendMail(
 		fmt.Sprintf("%s:%d", config.Config.Email.ServerAddress, config.Config.Email.ServerPort),
-		smtp.PlainAuth("", config.Config.Email.FromAddress, config.Config.Email.FromAddressPassword, config.Config.Email.ServerAddress),
+		smtp.PlainAuth("", config.Config.Email.MailerUsername, config.Config.Email.MailerPassword, config.Config.Email.ServerAddress),
 		config.Config.Email.FromAddress,
 		[]string{toAddress},
 		contents,