dear experts,
we are running Port25 for a while now, with no major issue. We have several blocks of IPs for a total of aroud 250 IPs - 1/2 used.
Today 60% of our IPs are blocked by spamhaus, on very different set/range of IPs and really different category of traffic - from the nicest to less nice traffic.
IPs are blocked - then ubblocked after 1 hour then blocked again.
Any help would be welcome.