Mailjet / noho.st domain validation

Note: it might be possible to use an smtp relay which offers an other ports.

If you can’t use smtp relay cause port are blocked an other way could be to use a vpn with a dedicated public ip.

About your question about adding some dns entries in noho.st subdomains, some entries could be forbidden. However it’s possible to try to create a hook custom_dns_rules

Note: it might be possible to use an smtp relay