Webform submissions

I see that notice appearing in the dblog even with anonymous webform submissions, so I don't think that's related to your problem. [Update: turns out it is, see below.]

Can you say a bit more about the specifics: is your anonymous or authenticated user getting denied access to the form itself, or does the problem happen upon submission?

By the way, about that warning: one way it is generated is if the default "from" address isn't filled in in the Webform settings at admin/config/content/webform.

Let's try to clear up the "Notice: undefined index" warning. (I can't follow your link, of course—which is as it should be.) Would you confirm that on the page at admin/config/content/webform, you have entered the "Default email values"? 

Let's just check something: in the E-mails settings for the webform,

• you've set the "E-mail reply-to address" to "Component", with the component that contains the submitter's email address.
• you've set the "Email reply-to name" to "Component", with the component that contains the submitter's name.

In that case you should have the from header of the email being "Submitter Name via From Name" <from@example.com>", and the reply-to header being "Submitter Name <submitter@theirdomain.com>".

What differences from that are you seeing?

Can you submit the bug report to the project for the "undefined index reply-to" error message? You can send it here: https://github.com/backdrop-contrib/webform/issues.

There's been a recent change to use Backdrop core's default of setting a reply-to header but looks like there's an edge case to fix. (See https://github.com/backdrop-contrib/webform/issues/157)

I use "Your email address" for the person submitting the form...

The on the "E-Mails" tab, set the "Email Reply-to address" to the "Your email address" field.

Hope this helps.