The University’s mail relays and encryption

By the time this post has been published, the Oxmail relays will most likely be using opportunistic encryption to encrypt outgoing emails, in response to actions by cloud mail providers. However, we would like to make it clear that we … Continue reading

Posted in Mail Relay, Message Submission | Tagged , , | 4 Comments

Cisco firewall SMTP “fixup” considered harmful

This issue is old and familiar to us, and crops up about once every six months or so. I thought it might help to document the situation more publicly. On Cisco firewalls (PIX or the newer ASA), various protocol inspection … Continue reading

Posted in Cisco Networks, Firewall, Mail Relay, Message Submission | 8 Comments