While Fail2Ban’s automation works great, we find that reviewing the “Recipient address rejected” section of Zimbra’s Daily Mail Report yields evidence of potential Advanced Persistent Threats as well as probes from senders whom you’d like to block. Manually grepping through /var/log/zimbra.log* on the logger host to find the sender’s IP …

Enhancing Email Deliverability for B2B senders’ outbound transactional and marketing emails was a core track at last week’s InboxExpo. This post covers several key takeaways to help you improve your B2B email deliverability. In case you missed it, to further reduce spam and domain spoofing specifically,  Google and Yahoo (affectionately …