On Wed, January 19, 2022 14:45, Wietse Venema wrote:
>
> "Connection refused" means that the TCP SYN request from your system
> got a TCP RST response. This response could be for a variety of
> reasons. One is that the host accepted no TCP connections on port
> 25, but that seems unlikely. More likely, some "bump in the wire"
> blocked the conection attempt before it even reached a mail server.
>
> As Victor noted, what Postfix stores is the last attempt. You may
> see other connection failures from the same Postfix SMTP client
> process to different gmail MX hosts.
>
> Wietse
>
I discovered my error. Or, perhaps an idiosyncrasy of FreeBSD jails. The issue
appears to be related to the order in which the IP4 addresses are assigned to
jails. In our setup we use a 192.168 address for internal communication
between hosts and only assign routable addresses to host with public services.
This includes SMTP services for system generated email notices. Postfix is
configured to listen on both the public and the private addresses.
On the original MX host's jail these were set as
em0|216.185.71.31,em0|192.168.216.31. This host did not report connection
errors.
On the host jail with the connection problems these were set to
em0|192.168.216.31,em0|216.185.71.31.
When I reversed the ip4 settings to match the original then the problem stopped
and the backlog of queued messages cleared almost immediately.
Thank you for the assistance. I appreciate it very much.
--
*** e-Mail is NOT a SECURE channel ***
Do NOT transmit sensitive data via e-Mail
Unencrypted messages have no legal claim to privacy
Do NOT open attachments nor follow links sent by e-Mail
James B. Byrne mailto:byrn...@harte-lyne.ca
Harte & Lyne Limited http://www.harte-lyne.ca
9 Brockley Drive vox: +1 905 561 1241
Hamilton, Ontario fax: +1 905 561 0757
Canada L8E 3C3
