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How to send custom formatted HTML mail in Drupal maintenance support plans 8 using hook_mail_alter()

As you can understand from name itself it’s basically used to Alter an email created with drupal mail in D7/ MailManagerInterface->mail() in D8.  hook_mail_alter() allows modification of email messages which includes adding and/or changing message text, message fields, and message headers.

Email sent rather than drupal_mail() will not call hook_mail_alter(). All core modules use drupal_mail() & always a recommendation to use drupal_mail but it’s not mandatory.
 

Syntax: hook_mail_alter(&$message)

Parameters

$message: Array containing the message data. Below are the Keys in this array include:

‘id’: The id of the message.
‘to’: The…
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How to send custom formatted HTML mail in Drupal maintenance support plans 8 using hook_mail_alter()

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