On 2/22/19 7:10 AM, Tim via users wrote:
If the numerical IP address of your service is shared between yourselves and others, whether that's because your IP can change at different logins, or other's use it simultaneously (such as webserver hosts that service many clients on the same numerical IP), you're not going to get the host to point their reverse DNS look-up to your domain name. You need a permanently unique IP to be able to do that. The same situation applies for HTTPS and certificates (you need to be the sole user of your IP).
This hasn't been true for a long time. I don't remember the acronym, but you can have an unlimited number of website hostnames on the same IP address that all have their own unique certificates.
1. You need a mail server on an IP that the rest of the world is willing to receive mail from. This will cost you more, and the average consumer ISP might not be able to supply one to you.
The ISPs here in Canada block port 25 so you can't directly send out. However, they provide a forwarder that you can send email through. You probably can't setup of SPF or DKIM (I haven't tried), but I've never had trouble sending mail from my server. I'm also not aware of anyone not being able to send to me as well.
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