I'll reply off-list as well, see if we can get some additional information.
________________________________________ From: mailop <[email protected]> on behalf of Jay Hennigan via mailop <[email protected]> Sent: Friday, December 17, 2021 7:18 PM To: mailop Subject: [EXTERNAL] [mailop] Comcast contact - IPv6 routing issue? Very small discussion list seeing bounces from Comcast. We are sending with IPv4 but bounce looks like an IPv6 network problem. Error message is as follows: (recipient usernames redacted). Can someone look into this or contact me offlist? Thanks! Final-Recipient: rfc822; [email protected] Original-Recipient: rfc822;[email protected] Action: failed Status: 4.4.1 Diagnostic-Code: X-Postfix; delivery temporarily suspended: connect to mx2h1.comcast.net[2001:558:fd02:243f::3]:25: Network is unreachable Final-Recipient: rfc822; [email protected] Original-Recipient: rfc822;[email protected] Action: failed Status: 4.4.1 Diagnostic-Code: X-Postfix; delivery temporarily suspended: connect to mx2h1.comcast.net[2001:558:fd02:243f::3]:25: Network is unreachable Final-Recipient: rfc822; [email protected] Original-Recipient: rfc822;[email protected] Action: failed Status: 4.4.1 Diagnostic-Code: X-Postfix; delivery temporarily suspended: connect to mx2h1.comcast.net[2001:558:fd02:243f::3]:25: Network is unreachable -- Jay Hennigan - [email protected] Network Engineering - CCIE #7880 503 897-8550 - WB6RDV _______________________________________________ mailop mailing list [email protected] https://urldefense.com/v3/__https://list.mailop.org/listinfo/mailop__;!!CQl3mcHX2A!TdYbjnwT169NFpvzA1sqagWhmgm5ZcF_mX9NfpJGS4IiYmwxJVo0wjR8KBxup1Ze6_-I$ _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
