How to Avoid Emails Being Marked as Junk Mail When Using PHP\'s mail Function?

Understanding Junk Mail Treatment

When sending emails using the PHP mail function, it is crucial to ensure proper delivery and avoid having them marked as junk mail. Several factors can contribute to this issue, one of which is related to the headers used in your email script.

Issue with Sender Address and Headers

As you mentioned, you provided valid email addresses for both the sender and receiver, which eliminates this potential issue. However, the issue may lie within the headers themselves.

Solution: Using Custom Headers

To resolve this, you can try customizing the headers to include:

• From: This header explicitly specifies the sender's email address.
• MIME-Version: Indicates the MIME (Multipurpose Internet Mail Extensions) version used.
• Content-type: Defines the type of email content, such as text/html or text/plain.

Here is an example of revised headers:

<code class="php">$headers = "From:<$from>\n";
$headers .= "MIME-Version: 1.0\n";
$headers .= "Content-type: text/html; charset=iso 8859-1";</code>

By adding these custom headers, you can potentially improve the classification of your emails as legitimate messages, reducing the likelihood of their being treated as junk mail.

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