For whatever reason I have was having the hardest time getting the MailGun plugin for GravityForms to use my From Email domain in WordPress.
Every time I tried to update the settings, I’d get the following error:
Every time I ran an update using the WordPress option, it worked. Grr..
Turns out, I’m an idiot.
Because I was using MailGun it was asking me for a verified domain with MailGun.
The problem I was having is that while the domain associated with {admin_email} was valid, it wasn’t verified with MailGun. Instead, what I had to do is manually override the value and use the MailGun validated domain.
For whatever reason, I drew a complete blank on this and had to stare at the problem for a while.
Example of what didn’t work:
admin@defragged.org
Didn’t work because the domain I validated with MailGun was mg.linuxerrors.net
Example of what did work:
admin@mg.defragged.org
Because this was the actual domain I had validated. Duh!