Thank you, gentleman. Since I was able to circumvent the issue and as Mark said, it's now more of a networking issue (probably w/Verizon and to get them to correct it would take hours of phone calls) I'm going to leave the issue as you said, to another time (sic: group).
Thank you for your assistance!!!! Wayne -----Original Message----- From: Mark Lawrence <[email protected]> Sent: Friday, April 25, 2025 2:31 AM To: Wayne Spivak <[email protected]> Cc: [email protected] Subject: Re: MTA stopped connecting to Postfix server on 587 > tcpdump -n -v host sbanetweb.com and port 587 tcpdump: listening on > eth0, This filter is too narrow to capture icmp traffic, for which the concept of a port does not apply, and because the source address could belong to some switch or router. Better would be: tcpdump -n -v 'icmp || tcp port 587' As Betarays said, a traffic capture on the destination would also provide more light. Host- and port specific filtering is ok and probably necessary there to minimize the noise. > Could a) rebooting the switch and b) rebooting the router at the NAS > location worth the effort. In the windows world that seems to often be a solution... but I think it is less effort in the long run to identify the root cause and make specific changes in response. But the effort/reward trade-off is an individual (or organisational :-) calculation. >MCQ (as does all the servers mentioned) have a internal IP (192 rnage) >through a NAT server to different public IP’s. They also have VPN >static ip’s. Multiple paths and multiple addresses are of course extra complexity, which I don't think we on this list are going to easily understand or fix in a few words. >I changed the relay address from my domain/public address to my VPN ip >address and mail was sent. > >... > >Why it's going two different ways (consistently over multiple attempts >is bizarre). > >What does that say? That there is clearly a network issue, and not obviously an OpenSMTPd one. So this is probably not the right place to solve it \_(ツ)_/. -- Mark Lawrence
