If you just need to use private DNS, one additional ip will be enough for you. If you also need SSL for your sites, then more ips will be needed.
Hello, set either hostname.tld or mail.domain.tld, don't use mail.hostname.tld as it is an incorrect PTR entry. After you set the correct PTR, you...
If you are not satisfied with their constant maintenance, I advise you to change the provider into a more reliable one? Did you search for some...
As far as I know invpsus.com offers cheap VPS servers for $5 per month. Did you try to contact them?
I guess that nowadays almost every hosting provider offers PHP support and allows to use php as a mail.php script
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