This document describes how to send an email attachment using Mule ESB's SMTP connector. It involves configuring a file inbound endpoint to read a file from a source directory, transforming it to a string, setting it as an attachment using the attachment transformer, and sending it via SMTP using properties like the host, username, password, to and from addresses. When run, it will read the file, send an email with it as an attachment, and output logs showing the file was read and email sent successfully.

1. Send email
attachment using
SMTP in Mule ESB
Presented by : Sreekanth Kondapalli

2. What is Mule ESB ?
 Mule ESB is a lightweight Java-based enterprise service
bus (ESB) and integration platform that allows
developers to connect applications together quickly and
easily, enabling them to exchange data. Mule ESB
enables easy integration of existing systems, regardless
of the different technologies that the applications use,
including JMS, Web Services, JDBC, HTTP, and more.

3.  This example shows how we can send email attachment using SMTP connector to
self or another email. We simply put a file in a source directory and Mule will
read the file from the source directory.
 Using Mule ESB it’s very easy to read the file from a location. If we had to read
the file using manual coding then we had to write many lines of code. But using
Mule ESB we just simply put a file in a directory and let the Mule know the file
path and Mule does the rest of the thing. Y
 You can put any kind of file to the source for reading. The file that we put into a
source directory will be an attachment to the intended recipient’s mail address.
So finally when we will see the file as an attachment in the mailbox.
What is Mule ESB ?

4. What is Attachment
transformer ?
 Attachment transformer lets us attach a file or
document which will be sent to the email address.

5. What is SMTP connector ?
 The SMTP endpoint allows Mule messages to be sent as
email or email attachments with the Simple Mail
Transfer Protocol (SMTP) using Java mail API.

6. Prerequisites
 Mule Studio 3.5.1
JDK 1.6
Maven 3
Mule Runtime 3.5.0 CE
Knowledge of XML

7.  Open Mule Studio and create a mule project. Go to File->New->Mule
Project. Now enter the Project Name, selectRuntime – Mule Server, check
the check box for Use Maven. Now enter the following information
 Group Id: your Mail(ex. gmail.com)
Artifact Id: project name – file-attachment(automatically populated when
project name is getting typed)
V
 Click Next and verify project Location and JRE/JDK are set correctly. Click
Finishersion: Mule studio generates default

8.  Now drag and drop the elements from right side of the Mule studio as shown
below in the picture.

10. Browse and select the path from where a file will be read for an attachment.
Logger component properties

11.  File to String transformer properties
 File-to-Strong transformer just transforms the file object to human
readable string format. We will not set any property for this element
Attachment transformer properties

12.  Using attachment transformer we can set payload from previous flow as an
attachment. We have to select Content Type, operation as Set Attachment,
Name, Value

13.  SMTP connector properties
For SMTP connector we have to input email host, user name, password,
port under Basic Settings and To Address, From Address, Subject under
Email Information.

14.  The whole XML file of entire flow
 <?xml version="1.0" encoding="UTF-8"?>

 <mule xmlns:smtp="http://www.mulesoft.org/schema/mule/smtp"
 xmlns:file="http://www.mulesoft.org/schema/mule/file" xmlns="http://www.mulesoft.org/schema/mule/core"
 xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
 xmlns:spring="http://www.springframework.org/schema/beans" version="CE-3.5.0"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
 http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
 http://www.mulesoft.org/schema/mule/file http://www.mulesoft.org/schema/mule/file/current/mule-file.xsd
 http://www.mulesoft.org/schema/mule/smtp http://www.mulesoft.org/schema/mule/smtp/current/mule-smtp.xsd">
 <flow name="file-attachmentFlow1" doc:name="file-attachmentFlow1">
 <file:inbound-endpoint path="D:AnypointWorkspacesource"
 responseTimeout="10000" doc:name="File" />
 <logger message="#[payload]" level="INFO" doc:name="Logger" />
 <file:file-to-string-transformer
 doc:name="File to String" />
 <logger message="#[payload]" level="INFO" doc:name="Logger" />
 <set-attachment attachmentName="attachment" value="#[payload]"
 contentType="text/plain" doc:name="Attachment" />
 <logger message="#[payload]" level="INFO" doc:name="Logger" />
 <smtp:outbound-endpoint host="mail.domain.com"
 user="emailAddress@domain.com" password="password" to="emailAddress@domain.com"
 from="emailAddress@domain.com" subject="Test Email" responseTimeout="10000"
 doc:name="SMTP" />
 <logger message="#[payload]" level="INFO" doc:name="Logger" />
 </flow>
 </mule>

15.  Now create a text file called file-attachment.txt and put it under selected
path, i.e., as per the above XML the file path is D:AnypointWorkspacesource.
 Do right-click on file-attachment.xml and click on Run As -> Mule Application
with Maven. Once the application up and running you will get the console
output and email attachment in your mailbox where you have sent the email.

16.  Output in console
 INFO 2015-03-05 09:25:46,372 [[file-attachment].connector.file.mule.default.receiver.01]
org.mule.transport.file.FileMessageReceiver: Lock obtained on file:
D:AnypointWorkspacesourcefile-attachment.txt
 INFO 2015-03-05 09:25:46,404 [[file-attachment].file-attachmentFlow1.stage1.02]
org.mule.api.processor.LoggerMessageProcessor:
org.mule.transport.file.ReceiverFileInputStream@6a150e
 INFO 2015-03-05 09:25:46,406 [[file-attachment].file-attachmentFlow1.stage1.02]
org.mule.api.processor.LoggerMessageProcessor: This is a file content
 INFO 2015-03-05 09:25:46,407 [[file-attachment].file-attachmentFlow1.stage1.02]
org.mule.api.processor.LoggerMessageProcessor: This is a file content
 INFO 2015-03-05 09:25:46,419 [[file-attachment].file-attachmentFlow1.stage1.02]
org.mule.api.processor.LoggerMessageProcessor: This is a file content
 INFO 2015-03-05 09:25:46,422 [[file-attachment].connector.smtp.mule.default.dispatcher.01]
org.mule.transport.service.DefaultTransportServiceDescriptor: Loading default outbound
transformer: org.mule.transport.email.transformers.ObjectToMimeMessage
 INFO 2015-03-05 09:25:46,428 [[file-attachment].connector.smtp.mule.default.dispatcher.01]
org.mule.lifecycle.AbstractLifecycleManager: Initialising:
'connector.smtp.mule.default.dispatcher.1213248'. Object is: SmtpMessageDispatcher
 INFO 2015-03-05 09:25:48,878 [[file-attachment].connector.smtp.mule.default.dispatcher.01]
org.mule.lifecycle.AbstractLifecycleManager: Starting:
'connector.smtp.mule.default.dispatcher.1213248'. Object is: SmtpMessageDispatcher

17.  Click on the attachment. You will see the below output in the browser.