Commerce Order confirmation e-mail in HTML

I use Drupal 8.7.3 with Commerce 2.

When the order process is complete, the confirmation email is sent, but the HTML tags are deleted.

The email has "content-type text / html; charset = UTF-8;".

Key value
8-bit content transfer coding
content type text / html; character set = UTF-8;
date Tue, 18 Jun 2019 23:39:22 +0000
of "Linux user" 
mime-version 1.0
received by localhost (sSMTP sendmail emulation); Tue, 18 Jun 2019 23:39:22 +0000
confirmed order # 2
x-mailer Drupal