In my WordPress v6.0, I configured sending SMTP mail (no-reply@example.com) via $phpmailer and it works fine.
I want to use another SMTP email account (contact@example.com) for all custom contact form communications.
Send a contact form email using wp_mail() like this:
wp_mail($form_to, $form_subject, $form_body, implode("\r\n", $form_headers));
How to identify the above wp_mail and use a specific SMTP account? Below is my code, without the real if condition to check:
// MAILER
add_action('phpmailer_init', 'send_smtp_email', 10, 1);
function send_smtp_email($phpmailer) {
$phpmailer->isSMTP();
$phpmailer->isHTML(true);
if (wp_mail == "contact_form") { // not a real condition, this is what I want to achieve
$phpmailer->Host = 'smtp.example.com';
$phpmailer->SMTPAuth = 'true';
$phpmailer->Port = 465;
$phpmailer->Username = 'contact@example.com';
$phpmailer->Password = 'password1';
$phpmailer->SMTPSecure = 'ssl';
$phpmailer->From = 'contact@example.com';
$phpmailer->FromName = 'Site Contact Form';
} else {
$phpmailer->Host = 'smtp.example.com';
$phpmailer->SMTPAuth = 'true';
$phpmailer->Port = 465;
$phpmailer->Username = 'no-reply@example.com';
$phpmailer->Password = 'password2';
$phpmailer->SMTPSecure = 'ssl';
$phpmailer->From = 'no-reply@example.com';
$phpmailer->FromName = 'Site Mail';
}
} 
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This is how I solved this problem.
Include custom headers in your comment form emails:
Comments: Comment Form.Use the
wp_mailfilter to check if the email sent by the comment form is as follows:add_filter('wp_mail', 'set_smtp_email_accounts'); function set_smtp_email_accounts($mail) { // Comment form mails custom header $header = $mail['headers']; $header_text = 'Comments: Comment Form'; $header_check = in_array($header_text, $header); //if comment form mails if ($header_check) { add_action('phpmailer_init', 'send_smtp_email_comments', 10, 1); // if comments form mail } else { add_action('phpmailer_init', 'send_smtp_email', 10, 1); } return $mail; }