(I can't tell whether most of these were received or not).
Do I have a problem at my end, or is it an issue with the recipients?
If you have 'conenction reset' or 'connection timeout' while in 'DATA' state, one of possible reasons is an 'MTU discovery' problem when either your or remote server have closed 'ICMP' in firewall.
Everything could be found in maillog if interpreted accordingly. If you can, please do grep for all 'm1BDYj Yo032697' entries in all maillog files.
Based on the above info, would you say that the problem is at the receiving end, or is there any reason to suggest something needs fixing at my end?
Based on the above info, would you say that the problem is at the receiving end, or is there any reason to suggest something needs fixing at my end? Hardly it configured to keep message for 3 weeks in a queue.
but then after exiting telnet, I rec'd a Symantec Email Proxy message: "...
was unable to be sent because the connection to your mail server was interrupted.
When I run 'mailq -q (using the domain of the messages not received), they all show: reply: read error There are about 6 messages like this dating back about 3 weeks.Also check that your local firewall don't forbid icmp packets.There are no other log entries matching the same ID -- just the two I provided.You didn't say about firewall settings between your mail server and the Internet. On your Linux mail host try to run 'sysctl net.ipv4.ip_no_pmtu_disc=1' and then rerun 'mailq'. To debug network problems run 'tcpdump -s 2000 -w /tmp/host 220.127.116.11' in one window (or SSH session), and run 'mailq -q Rdomain.com' in the other. Then download /tmp/and see (with wireshark program) on what step you have a connection reset.You may post the dump here as a file, if you can't find the source of the problem yourself. The manual test (via telnet) was successfule -- the message was received by the recipient.Each time the mail is 'deffered', there is a reason in log entry. I said about graylisting, because this reason was in your list and it's confusing if you don't know what is it.