Can we send without HTML

[ghost]

It works if I didn't specify the AltBody:
$mail->isHTML(true); $mail->Body = 'This is the HTML message body <b>in bold!</b>';

But what if I want to send without HTML ( I'm sure the content should only be plain text ):
$mail->AltBody = 'This is the body in plain text for non-HTML mail clients';

This throws an error saying that the Body is missing.

Another question, do $mail->AltBody required / necessary when I only want to send HTML content like the first example?

[Synchro]

If you want to set plain-text only, that's the default behaviour, so it's very simple:

$mail->Body = 'my message body';

Body is a plain text body by default, but if you call isHTML, it will be handled as HTML, so this will produce an HTML-only message:

$mail->isHTML();
$mail->Body = '<b>my HTML message body</b>';

AltBody is there to provide a fallback to plain text, and typically you only set that if you are also using HTML:

$mail->isHTML();
$mail->Body = '<b>my HTML message body</b>';
$mail->AltBody = 'my plain text message body';

The msgHtml() method provides a shortcut and some automation to this process:

$mail->msgHtml('<b>my HTML message body</b>');

This will call isHTML, set Body to the HTML you provide (after some processing to handle images), and strip tags and use it to set AltBody.

[ghost]

@Synchro May I know how to add line break for plain-text for ( $mail->Body without $mail->isHTML() ) and ( $mail->AltBody ).

[Synchro]

Lin breaks will be ignored in rendered HTML - you need to use p and br tags to add them. In plain text, line breaks will be preserved as in the original text, so you should not have to do anything.