> On Dec 20, 2022, at 9:08 AM, Janos Dohanics <w...@3dresearch.com> wrote: > > 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
The goal is to have a matching PTR and A record. If you are able to have an A record of customer.com pointing to only that IP address, then you can use it as is. If the customer has multiple IPs, particularly if they have a web server on a different IP, then you’ll need to get this corrected. — Noel Jones
