Sending Email In Java Using Smtp – This guideline assumes that an email coordination component provided by the JavaMail API and Spring Framework is used.
The description covers only the part related to sending an email. The processing method in connection with the sending of an email is not mentioned. (An example is introduced for a processing method.)
Sending Email In Java Using Smtp
JavaMail provides an API for sending and receiving email in Java. Although it is included in Java EE, it can also be used in Java SE as an add-on. Using JavaMail, the email functionality can be easily integrated into a Java application.
Part 3 — How To: Send Emails From A Spring Boot Application
Also, since it is assumed that Spring Framework email coordination component is used in this guideline, the details related to JavaMail API are not covered. See JavaMail API Design Specification for JavaMail API specifications.
Of Spring described later is used, it is possible to connect to an email server without handling an email session directly.
Package) to send an email. The component included in the package hides the detailed logic related to sending email and performing low-level API handling (JavaMail API call).
The method by which the component provided by the Spring Framework for sending e-mail sends an e-mail is explained before the explanation of basic implementation methods.
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The method to implement process to send email using interface and class below is explained in this guideline.
In the setup example above, since the dependent library version is assumed to be managed by the parent project terasoluna-gfw-parent, there is no need to specify the version in pom.xml. The top dependency library used by terasoluna-gfw-parent is defined by Spring IO Platform.
Email session provided by Application Server ¶ Sr. Now. Refer Apache Tomcat 8.5 Application Server Page Refer Apache Tomcat 8.5 User’s Guide (WHAT-Resources) (JavaMail Sessions). Apache Tomcat 8.0 Refer to Apache Tomcat 8.0 User’s Guide (JNDI Resources HOW TO) (JavaMail Sessions). Oracle WebLogic Server 12c Refer to Oracle WebLogic Server 12.2.1.0 documentation. IBM WebSphere Application Server Version 9.0 Refer to WebSphere Application Server Version 9.0.0 documentation. Red Hat JBoss Enterprise Application Platform Version 7.0 Refer to JBoss Enterprise Application Platform 7.0 Product Documentation. Red Hat JBoss Enterprise Application Platform Version 6.4 Refer to JBoss Enterprise Application Platform 6.4 Product Documentation.
“. Please note that, if an SMTP server does not support STARTTLS, even if specified as below, plain text will be used for communication. When
How To Send An Email Using Java (gmail Smtp Server)
If a plain text email (an email that does not require code specification or attachments) is to be sent in English,
Of a template, if a fixed location is specified (for example sender email address etc.) in the e-mail message as a template, it is not necessary to specify it individually later in the e-mail message.
When setting an email header, an email header should be considered. See Email Header Injection Countermeasures for details.
When sending email in Japanese, ISO-2022-JP can also be used in encoding if it is also necessary to support an email client that does not support UTF-8. Refer to ISO-2022-JP Coding Considerations for the points to consider when using ISO-2022-JP in coding.
Configure The Smtp Server
If an externally inserted value is used when generating HTML for an email body, XSS attack countermeasures must be used.
Exceptions at the time of sending an email ¶ Sr. None Exception Class Conditions MailAuthenticationException Occurs on authentication failure. MailParseException Occurs when an invalid value is set in the email properties. MailPreparationException Occurs when an unexpected error occurs while creating an email message. Unexpected errors, for example, are the errors that occur in the template library. Exceptions that occur in
It is not recommended to build an email body directly in Java source as shown in the implementation examples above for the reasons given below.
Therefore, it is recommended to use a template library to define email text design. A template library should be used especially if the email text is particularly complex.
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In the setup example above, since the dependent library version is assumed to be managed by the parent project terasoluna-gfw-parent , specifying the version in pom.xml is not necessary. The top dependency library used by terasoluna-gfw-parent is defined by Spring IO Platform.
When sending an email in Japanese, if the email client receiving the sent email cannot be restricted, it is necessary to consider the use of ISO-2022-JP in encoding. This is because the legacy email client does not support UTF-8.
When encoding based on JIS X 0208 character set including ISO-2022-JP is set for the string entered by MS932, a short circuit occurs for seven characters described in the table below.
This problem occurs during character code conversion with Unicode due to the presence of characters that exist in MS932 but not in JIS X 0208. in service. Note that a conversion process is not necessary when using x-windows-iso2022jp described later.
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Because it is a problem that arises when mapping to Unicode, conversion is necessary regardless of the character code of an input value. Header and body text, which may contain strings of Japanese text, are used for conversion. From, To, Cc, Bcc, Reply-To, Subject etc. are examples of the header that can contain Japanese text and are often used in general.
These characters should basically not be used. If it is necessary to use these characters, settings as follows can be made as JVM startup options. In addition, if ISO-2022-JP encoding is configured, these characters can be replaced so that they can be mapped to x-windows-iso2022jp.
X-windows-iso2022jp is an ISO-2022-JP implementation that includes a mapping (MS932 base) that differs from ISO-2022-JP standards. If ISO-2022-JP encoding is specified in the email header, it will depend on the email client whether the out-of-range extensions are handled in the implementation. As a result, it cannot be guaranteed that there will be no boredom in all email clients, even if mapping is done with x-windows-iso2022jp.
If extension characters can also be converted to alternate characters, a method where conversion is done independently in the application should also be considered similar to seven characters described earlier.
Sending E Mail (smtp) — Terasoluna Server Framework For Java (5.x) Development Guideline 5.4.1.release Documentation
In JavaMail, body text of an e-mail to be sent ends with multibyte characters, additional characters (“?”, “w”, etc.) are likely to be implemented. The following methods can be used to prevent these occurrences.
If an email header injection attack is successful, email is sent to an unintended address and may therefore end up as “junk”. If a character string that is inserted externally is used in the content of the email header (subject, etc.), it becomes necessary to take countermeasures against email header attacks.
Since sending an email is a time-consuming process, the response time may increase if an email is sent during a web application. Therefore, email is usually not sent during a web application and a method is adopted in which email is sent asynchronously. Although the process for sending the email is not described in detail here, the example given below can be used as a reference.
Enter the functions given below in the application if you want to send an email based on the email information stored in a database or message queue.
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If an email is continuously sent by a postal service, it is determined as spam. A method can be considered as a countermeasure where the sending sequence is set to be random so that emails are not sent consecutively for the same domain.
A method in which GreenMail is used as a fake server to test the email sending function is introduced. GreenMail can also be used by deploying a war file in addition to using it as a library.
In this example, it is assumed that the email is sent asynchronously and the waiting time for email arrival is a maximum of 3 seconds. A tag already exists with the specified branch name. Many Git commands accept both tag and branch names, so creating this branch can cause unexpected behavior. Are you sure you want to create this branch?
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Simple Java Mail
Sending Email from Java Applications Introduction How does email work? Setting up a test SMTP server JavaMail API Apache Commons Email Spring Email Support Sample web application which approach to use?
Sending email is a common function required in many business applications. From simple plain text notifications to complex reports with links and multiple attachments, email is a common mode of asynchronous communication with end users.
Although email operations include sending, receiving, deleting, setting flags, and others depending on the specific email server used, this tutorial only discusses sending email via SMTP.
Let’s start with a quick overview of the email communication process. It all starts with the end user composing a message using a client desktop or web application. The message is sent through multiple network devices until it reaches its destination at the recipient’s machine. The relevant elements of this process are presented in the following figure:
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After the end user has triggered the action to send the e-mail, the client application connects to its configured e-mail server, the SMTP server, which can be described as a program that can communicate with other SMTP servers with the Simple.
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