Over the past couple of days I have been receiving complaints of emails being delayed in some cases by several hours.
Seems the offending domains that are being delayed are Google's Gmail.
I have tried to no avail fixing this.
Disabled SORBS as the Google IP's are blacklisted.
Added whitelist IP ranges of gmail IP's - not sure if this is a good idea?
And combinations of these on and off.
Nothing seems to work - emails sometimes come through from gmail quickly - I assume because it gets sent from an IP that is not blacklisted and then 5 minutes later the emails get delayed for hours. Sent from a blacklisted IP I assume.
Whitelisting seems to make no difference. And disabling SORBS RBL's - also questionable.
Anyone experiencing these issues and what to do?