Hi Xavier,
If your secondary MX will refuse email with a relaying error, it's not a
valid MX and should be removed from DNS...
This doesn't explain outlook.com favouring it but also, they've pulled
you up on poor configuration. :-)
No point in having an advertised MX that isn't ready for action yet. DNS
is easily changed when you are good to go.
Mark.
On 16/06/2021 7:04 pm, Xavier Beaudouin via mailop wrote:
Hello there,
I have a setup with 2 MX :
domain.tld mx 10 mx1.domain.tld
domain.tld mx 30 mx3.domain.tld
For some operational reason mx3 replys all mail with a 454 which is TEMPORALY
error... :
Jun 14 23:22:55 mx3 postfix/smtpd[83891]: NOQUEUE: reject: RCPT from
mail-eopbgr50127.outbound.protection.outlook.com[40.107.5.127]: 454 4.7.1 <[email protected]>:
Relay access denied; from=<[email protected]> to=<[email protected]> proto=ESMTP
helo=<EUR03-VE1-obe.outbound.protection.outlook.com>
It trys about 31 times.... But they didn't had the idea to check the mx1...
which is ready for relay.
Is there any good reason that outlook.com works like a spammer trying to send
mail ONLY to lowest MX server ???? Really guys fix your stuff...
Regards,
Xavier
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