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I have 4 domains using domain access module like a.com, b.com, c.com, d.com. currently when user registers he receives a mail from [email protected] which is default in site configuration. Now what I want is to Change system mail on run time with respect to 4 diffrent domains so that when user registers from b.com he will receive mail from [email protected] and so on.As this info is saved in system configuration so how to change the mail id of the site when sending mail on run time.

1 Answer 1

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You can alter the mail using hook_mail_alter(&$message)

Alter an email message created with MailManagerInterface->mail().

with in message array you have 'from' field as well.

Example

function mymodule_mail_alter(&$message) {
  if ($message['id'] == 'modulename_messagekey') {
    // Login to get domain specific email id.
    $email_id == _some_logic_to_get_email();
    $message['from'] = $email_id;
  }
}

Refernce: https://api.drupal.org/api/drupal/core%21core.api.php/function/hook_mail_alter/8.2.x

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