DuoCircle's Outbound SMTP service blocks all email sent from sender addresses using the .xyz top-level domain (TLD). This block is enforced at the platform level and applies unconditionally to all .xyz sender domains.

Why is .xyz blocked?

The .xyz TLD has been subject to consistently high volumes of spam and abuse across our platform. The level of abuse originating from .xyz domains has been disproportionate compared to other TLDs, and despite ongoing efforts to address individual bad actors, the problem has persisted across a wide range of senders within the TLD. To protect the deliverability and reputation of all customers sharing our sending infrastructure, we made the decision to block the entire TLD at the system level.

Are exceptions available?

No. Because this is a platform-level block applied in our mail processing layer, it cannot be overridden on a per-account or per-domain basis. There are no exceptions available regardless of account standing, sending history, or support escalation.

What are my options?

If you need to send email through DuoCircle's Outbound SMTP service, you will need to use a sender address on a different domain. We recommend registering a domain under a commonly accepted TLD such as .com, .net, .org, or another reputable TLD for your sending needs.

Is .xyz the only TLD blocked this way?

Yes. The .xyz TLD is the only top-level domain we currently block unconditionally at the platform level. All other TLDs are evaluated on the basis of individual sender reputation and other standard filtering criteria.