Plain Text / HTML email notification issue

There’s definately an issue with sending e-mails. When using default e-mail templates, they’re fine, in HTML.

However changing anything on E-mail settings tab results in plain text mail notifications: without line-breaks, etc.

Related:

https://ww.wp.xz.cn/support/topic/issue-plain-text-vs-html-email
https://ww.wp.xz.cn/support/topic/broken-format-for-all-support-email-templates

Please advise.

I’ve purchased some add-ons too. Hope to set up the email notifications for a customer support service.

https://ww.wp.xz.cn/plugins/awesome-support/