How to Modify the Envelope \'From\' Address in PHP Mail?

Altering Envelope "From" Address in PHP Mail

PHP's mail() function allows users to send emails using a local mail server, such as Sendmail. However, certain remote mail servers may reject emails when the envelope "From" address (MAIL FROM) is set to the Apache_user@localhostname format. This arises because the domain associated with the address doesn't exist.

To address this issue, one can utilize the optional 5th parameter in the mail() function to specify additional options for Sendmail. By supplying the "-f [email protected]" option, it's possible to override the default envelope "From" address and set it to an arbitrary value, such as [email protected]

For instance:

<code class="php">mail('[email protected]','subject!','body!','From: [email protected]','-f [email protected]');</code>

In this example, the email will be sent from the [email protected] address instead of the default Apache_user@localhostname.

An alternative approach using sendmail directly via a command line may be considered, but it's less PHP-specific and may not always be practical. Nonetheless, the usage of the 5th parameter in mail() provides a straightforward and PHP-centric method for modifying the envelope "From" address in PHP mail.

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