Fix sending email when from address is empty string (#9126)

app/server/appsmith-server/src/main/java/com/appsmith/server/configurations/EmailConfig.java

@@ -1,20 +1,30 @@
 package com.appsmith.server.configurations;
 
+import lombok.AccessLevel;
 import lombok.Getter;
 import lombok.Setter;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.util.StringUtils;
+
+import javax.mail.internet.InternetAddress;
+import java.io.UnsupportedEncodingException;
 
 @Getter
 @Setter
 @Configuration
+@Slf4j
 public class EmailConfig {
 
     @Value("${mail.enabled}")
     private boolean emailEnabled = true;
 
-    @Value("${mail.from}")
+    @Setter(AccessLevel.NONE)
-    private String mailFrom;
+    private InternetAddress mailFrom;
+
+    private static final String DEFAULT_MAIL_FROM = "appsmith@localhost";
 
     @Value("${reply.to}")
     private String replyTo;
@@ -25,4 +35,23 @@ public class EmailConfig {
     @Value("${mail.support}")
     private String supportEmailAddress;
 
+    @Autowired
+    public void setMailFrom(@Value("${mail.from}") String value) {
+        if (!StringUtils.hasText(value)) {
+            value = DEFAULT_MAIL_FROM;
+        }
+
+        try {
+            mailFrom = new InternetAddress(value, "Appsmith");
+        } catch (UnsupportedEncodingException e) {
+            log.error("Encoding error creating Appsmith mail from address. Using default from address instead.", e);
+            try {
+                mailFrom = new InternetAddress(DEFAULT_MAIL_FROM, "Appsmith");
+            } catch (UnsupportedEncodingException ignored) {
+                // We shouldn't see this error here with the default address parsing.
+                log.error("Encoding error with default from address. This should've never happened.", e);
+            }
+        }
+    }
+
 }

app/server/appsmith-server/src/main/java/com/appsmith/server/notifications/EmailSender.java

@@ -28,15 +28,12 @@ public class EmailSender {
 
     private final EmailConfig emailConfig;
 
-    private final InternetAddress MAIL_FROM;
-
     private final InternetAddress REPLY_TO;
 
     public EmailSender(JavaMailSender javaMailSender, EmailConfig emailConfig) {
         this.javaMailSender = javaMailSender;
         this.emailConfig = emailConfig;
 
-        MAIL_FROM = makeFromAddress();
         REPLY_TO = makeReplyTo();
     }
 
@@ -96,8 +93,8 @@ public class EmailSender {
 
         try {
             helper.setTo(to);
-            if (MAIL_FROM != null) {
+            if (emailConfig.getMailFrom() != null) {
-                helper.setFrom(MAIL_FROM);
+                helper.setFrom(emailConfig.getMailFrom());
             }
             if (REPLY_TO != null) {
                 helper.setReplyTo(REPLY_TO);
@@ -114,15 +111,6 @@ public class EmailSender {
         }
     }
 
-    private InternetAddress makeFromAddress() {
-        try {
-            return new InternetAddress(this.emailConfig.getMailFrom(), "Appsmith");
-        } catch (UnsupportedEncodingException e) {
-            log.error("Encoding error creating Appsmith mail from address.", e);
-            return null;
-        }
-    }
-
     private InternetAddress makeReplyTo() {
         try {
             return new InternetAddress(this.emailConfig.getReplyTo(), "Appsmith");

app/server/appsmith-server/src/main/resources/application.properties

@@ -58,7 +58,7 @@ spring.redis.url=${APPSMITH_REDIS_URL}
 #   default localhost:25 SMTP server and throw an error. If false, this error won't happen because there's no attempt
 #   to send an email.
 mail.enabled=${APPSMITH_MAIL_ENABLED:false}
-mail.from=${APPSMITH_MAIL_FROM:appsmith@localhost}
+mail.from=${APPSMITH_MAIL_FROM:}
 mail.support=${APPSMITH_MAIL_SUPPORT:support@appsmith.com}
 reply.to=${APPSMITH_REPLY_TO:appsmith@localhost}
 spring.mail.host=${APPSMITH_MAIL_HOST:}