Gmail Messages Blocked
This was asked back in August and is unresolved:
Messages from gmail accounts to cox email addresses are being blocked. We (I have a half-dozen besides myself) have noticed this on several occasions. There are times the emails come through from gmail just fine but often they are blocked. After a day or two, the sender receives a response notifying them that the messages are not being delivered.
After some research, it appears that gmail may have changed how they send (batch) emails to cox to which cox now claims they cannot handle the volume of emails in the batches. Whatever the true reasoning or issues are, the bottom line is this: emails sent to cox accounts from gmail accounts are not always being delivered. Most recently (that I am aware of), this happened to me from a Monday email. Although it was sent at 4pm Monday, I did not receive until 8pm Tuesday evening. Thankfully I received it. Unfortunately, we have no way of knowing how many gmail messages we do not get.
I have contacted cox via chat a few times and, although they somewhat acknowledge there is an issue, there is no ETA nor does their seem to be a major concern when or if this will ever be fixed. You might notice that nothing is listed on their support page as an issue/outage. Although it isn't working, there is very little acknowledgment of the issue and even less concern of it being addressed.