Incoming destination port 25 blocked on IPv6 only?
Working through enabling IPv6 on my postfix-based Linux mail server connected to a DPC3939B. I am successfully getting the 2601::/64 address on the mail server's WAN interface, and I am able to successfully connect and send/receive mail on v6 ports 465 & 587. but port 25 seems blocked. A telnet attempt to port 25 from another Comcast IPv6 address yields a timeout, and a packet trace on the mail server's WAN during that telnet attempt shows no traffic reaching the server. The server is using 1 of 5 static IPv4 addresses, and port 25 is NOT blocked on that. Thoughts?