On 30/09/24 18:54, Danjel Jungersen via Postfix-users wrote:
>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.
I had to ask my ISP 4 or 5 times.
They kept insisting that they did not block port 25, I kept telling them
"you do".
You can verify it yourself by checking several different hosts with nc
or telnet (from the server):
nc fb.mail.gandi.net 25
nc smtp.google.com 25
nc hotmail-com.olc.protection.outlook.com 25
nc mx-aol.mail.gm0.yahoodns.net 25
...etc
Of course it is possible you've configured your server's firewall to
block those but usually you would configure your server to block inbound
ports, not outbound.
Peter
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