domainSummarymail.brt.san.ru are subdomains to this hostname. san.ru is a domain controlled by three nameservers at san.ru themselves. All of them are on the same IP network. Incoming mail for san.ru is handled by two mailservers also at san.ru. Two mailservers have the same IP number. san.ru has one IP number , but the reverse is mail.san.ru.DNS Records
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