I included a "custom email from", using an email that actually exists on my domain, and checked the box "Enable when web host requires Mail From strictly tied..."
While testing the form, a few demo contact messages had non-existent "from" email addresses (firstname.lastname@example.org). Observations:
a. Many of these "from nonexistent email addresses" contacts took 4 hours to land in my Gmail mailbox.
b. Looking at the header information for these emails, the "From" showed the nonexistent email email@example.com, rather than the "custom email from" address.
(and btw, I have no problem with non-existent emails being treated differently than real addresses. I just want to understand what is actually happening when they are processed.)
1. I thought that designating a "custom email from" would cause the email containing the message to show a "from" of the real email I designated, rather than showing the non-existent email address.
Do I misunderstand how the "designated real email" idea works?
2. Possible recommendation: It seems to me that, if someone designates a "custom email from", that this should be the actual "From" address used in the email delivered to the Inbox.
(All tests using real email addresses worked fine, which is the most important thing.) --Bill