I have my zoneedit mail forward set to forward to two separate email addresses, one gmail, one rogers.com. Emails going over to rogers come through in a few seconds (rarely taking as long as a minute), while email to gmail takes typically an hour or so. The delay on the gmail side started in the last couple of days.
I don't know wheather this issue is at the ZoneEdit end or the Gmail end.
If anyone in zone edit support is monitoring this and wants headers, I can send many examples.
(Does not appear to be an SPF thing, as far as i can tell).
This is not a critical issue to me as this is a personal email account, however it is annoying.