Hello, I have asked my customer's ISP to set reverse DNS as "smtp.customer.com" for the IP address the ISP newly assigned to them.
They set the reverse DNS as "customer.com", which will pass the requirement set by the restriction "reject_unknown_reverse_client_hostname" or similar restrictions used by other MTAs. Can I assume that this is "good enough" or should I pester the ISP to have "smtp.customer.com" set? Would you please advise? -- Janos Dohanics
