Email address still showing as unverified in EmailOctopus
If you've definitely verified your email address, first check that the casing matches (i.e. if you verified firstname.lastname@example.org, don't send from JOHN@YourDomain.com).
If you're still receiving an error, check the region in the top right of your SES console. This value, e.g. 'Europe (Ireland)', must match the region set in your EmailOctopus AWS settings.