Is vassilev.at valid?

Domain: vassilev.at

Valid: Yes

This domain is valid and should be able to receive e-mail.

Tested MX: mailx.drei.at (213.94.78.179)

Using MX pointer mailx.drei.at from DNS with priority: 10

Block: No

You do not need to block this domain for signups/registrations.

Disposable: No

This does not look like a temporary/disposable e-mail domain.

Raw API reason:

USE THE API, DO NOT SCRAPE THIS DATA

Heuristics: WM1

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