It's very frustrating. I've run my own mail server since before Google existed. Sometimes I have deliverability problem with Google Mail. Only there as far as I know, and not all the time. But sometimes it'll just put custom-written, non-bulk email in spam.
Even though I have friends at Google, I can't find out what's going on. Apparently that team won't even talk to other Googlers. It's maddening. Now if I need something to really go through (e.g., contacting somebody about a job) I have to send the mail from my gmail account. That feels like rewarding them, but I don't seem to have a choice.
You're asking if my IP address has been the same since 2004? No, we've changed providers a couple of times. But it's been stable for the last 5 years at least.
Even though I have friends at Google, I can't find out what's going on. Apparently that team won't even talk to other Googlers. It's maddening. Now if I need something to really go through (e.g., contacting somebody about a job) I have to send the mail from my gmail account. That feels like rewarding them, but I don't seem to have a choice.