What are common pitfalls when trying to modify a PHP script to change the sender's email address?

Common pitfalls when trying to modify a PHP script to change the sender's email address include not updating all instances of the email address in the code, not properly sanitizing user input, and not ensuring that the new email address is valid and allowed by the email server. 

// Incorrect way to change sender's email address
$from_email = "old@example.com";
$headers = "From: $from_email";

// Correct way to change sender's email address
$new_from_email = "new@example.com";
$headers = "From: $new_from_email";

Keywords

PHP email sender modification validation

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