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POImplementing mailing properly in my java application
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I am trying to implement mailing system within my java application and I am not sure how send the emails so that they are respected by the mail servers and their spam filters. I will be sending emails with "finish your registration", "forgotten password" and notifications which happen within the user's account. At the moment I am sending the emails normally via my gmail account (I don't necessarily need to use gmail). However after a few sent mails, I get to point that gmail stops delivering my mails unless I log in into the gmail web application. I send it via classic Java mail API: <pre><code>// settings properties = System.getProperties(); properties.put("mail.smtp.host", smtpServer); properties.put("mail.smtp.port", smtpPort); properties.put("mail.smtp.socketFactory.port", smtpPort); properties.put("mail.smtp.socketFactory.class", SSLSocketFactory.class.getName()); properties.put("mail.smtp.auth", "true"); // sending email via smtp Session session = Session.getInstance(properties, authenticator); final MimeMessage message = new MimeMessage(session); message.setFrom(new InternetAddress(from)); message.addRecipient(Message.RecipientType.TO, new InternetAddress(to)); message.setSubject(subject, "UTF-8"); message.setContent(content, "text/html; charset=UTF-8"); Transport.send(message); </code></pre> So do I have to use my own SMTP server? What about the default sendmail linux command, why would I need SMTP? From PHP we can send email directly without SMTP, can I achieve this with Java as well? <pre><code><?php mail($to, $subject, $message, $headers); ?> </code></pre> Which of these techniques is the most correct? How to use these services so that they are trustful to others? What can I do to be not marked as spam? 
Tags
<java><email><smtp>
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Implementing mailing properly in my java application
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