It took a week to figure out because I had some PHP problems to solve first, but when I finally got down to it, the problems were these:

• The certificates in main.cf were incorrectly specified. On the old system, I was using the standard snakeoil certificates. Maybe I should use the ones that I bought for my server instead? This change may not have affected anything.

• I didn't have TLS support enabled. Those pesky "#" symbols!

• I enabled DKIM for outbound email on the server provider's site. I didn't have that before, but I know it's better to have it than not.

• The most important thing I didn't know until after I fixed all of the above. My zone file on my server's provider didn't have the IPv6 reverse DNS record in it! I added that, and mail started flowing. What I thought was odd was that old messages had been flushed from the queue. I expected to get a lot of test messages, but they were all removed.


Mail is now flowing nicely as it should when program streams complete.


On 9/30/2024 12:00 AM, Peter via Postfix-users wrote:
On 30/09/24 10:38, Steve Matzura via Postfix-users wrote:
2024-09-29T21:31:27.402601+00:00 tgv24 postfix/error[1775]: B9E5510584F: to=<tgvpad...@theglobalvoice.info>, orig_to=<tgvpadmin>, relay=none, delay=48744, delays=48594/150/0/0.01, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to fb.mail.gandi.net[217.70.178.216]:25: Connection timed out) 2024-09-29T21:31:27.403862+00:00 tgv24 postfix/smtp[1744]: connect to fb.mail.gandi.net[217.70.178.217]:25: Connection timed out 2024-09-29T21:31:27.407038+00:00 tgv24 postfix/error[1774]: B46BD105849: to=<tgvpad...@theglobalvoice.info>, orig_to=<tgvpadmin>, relay=none, delay=84686, delays=84535/150/0/0.01, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to fb.mail.gandi.net[217.70.178.216]:25: Connection timed out) 2024-09-29T21:31:27.410377+00:00 tgv24 postfix/error[1775]: C72C0105866: to=<tgvpad...@theglobalvoice.info>, orig_to=<tgvpadmin>, relay=none, delay=27148, delays=26998/150/0/0.01, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to fb.mail.gandi.net[217.70.178.216]:25: Connection timed out)

This log entry repeats ad infinitum.

This looks like a port 25 block to me.  Check with your host to make sure they are not blocking outbound port 25, many of them require a request to open the port.


Peter
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