I do too, gmail is not a problem at all, but I have had the same static IP on AWS for about a decade, reverse DNS is mandatory for deliverability. My problem with Gmail is it is difficult to filter SPAM coming from their servers.
My biggest problem with mail delivery is sending mail to Microsoft properties. I've had to resort to sending those messages via SES.
Open source webmail solutions suck, so now I'm paying fastmail and forwarding incoming messages there.
Also run my one server for years without too much trouble. Hotmail is the one giving me the most hassle - for some reason they periodically block my IP address for apparently belonging to an ASN they block … except it belongs to an entirely different ASN. My provider (RamNode) say they’ve been trying to get someone there for years to fix their system but didn’t help, so I just fill in their unblock form now and again.
If you have any neighbourgh on your block that has sent spam, then the entire IP block gets a bad reputation. I moved away from OVH because of this. I no longer get the issue )on Vultr) but still get 100% blocked by outlook.com and blocked by Gmail if I'm the one initiating the conversation (I can mail people once they've emailed me at least once)
Their email referenced AS3150 ... Here is what the (clearly frustrated) RamNode support person had to say last time I enquired:
AS3150 is NTT, a large backbone provider: https://bgp.he.net /AS3150
RamNode runs AS3842 and AS198203. We have contacted them before - they don't know why nor care why their system is raising issue with AS3150 in regard to emails from our network.
But this issue isn't exclusive to our network either, and no other major email provider blocks emails like this.
My biggest problem with mail delivery is sending mail to Microsoft properties. I've had to resort to sending those messages via SES.
Open source webmail solutions suck, so now I'm paying fastmail and forwarding incoming messages there.