domainSummaryr1.sv4.ctmail.com and r2.sv4.ctmail.com are subdomains to this hostname. ctmail.com is a domain controlled by five nameservers at ctmail.com themselves. All of them are on different IP networks. Incoming mail for ctmail.com is handled by two mailservers at prontomail.net. They are on different IP networks. ctmail.com has one IP number.DNS Records
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