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All settings including API key look good, all necessary DNS records added, domain is verified, ports are open, but I cannot send email from the domain.
Versions:
WordPress: 5.1.1
WordPress MS: No
PHP: 7.0.33
WP Mail SMTP: 1.4.2
Params:
Mailer: mailgun
Constants: No
Api Key / Domain: Yes
Debug:
Mailer: Mailgun
Forbidden
Please tell me what the “Forbidden” refers to and how to change it?