Successfully set up the Configure SMTP plugin on a WordPress installation but the test email I'm receiving at my Gmail account says:
Gmail couldn't verify that... ...actually sent this message (and not a spammer)
The domain name is with Ionos and the site hosted at Opalstack.
Found a post on this forum referencing:
v=spf1 include:spf.opalstack.com ~all
Is this the correct value to use?
It wasn't clear to me if this SPF value needs to be configured at the domain provider ( IONOS ) or configured at Opalstack.