Infomaniak

Infomaniak is a swiss-based web and email provider that provides email hosting for domains bought at Infomaniak.

Codes

450↑: 450 4.1.8 Sender address rejected: Domain not found (in reply to RCPT TO command))
The sender domain is not a valid domain or the domain has not been registered yet. This prevents spammers from making up non-existent domains that can't receive email.
550↑: 550 5.7.1 rejected by DMARC policy for example.com (in reply to end of DATA command),
The email failed DMARC and you have a reject policy. Make sure your email is authenticated and aligned with SPF and/or DKIM. Contact your email provider for more details on how to configure them.; 550 5.1.1 Recipient address rejected: User unknown in virtual mailbox table,
The email address does not exist. Check to make sure there are no typos or other mistakes with the address
554↑: 554 5.7.1 Relay access denied
You are sending an email to a server that has not been configured to receive email for that domain.