NOQUEUE: reject using Direct Email Delivery

I have a new discourse installation and am setting up Direct Email Delivery according to these instructions: [Straightforward direct-delivery incoming mail]

I have this working on a different forum, no problem. However, on the new forum no inbound emails are getting delivered. When running ./launcher logs mail-receiver I see the email message is getting rejected. Any thoughts on trouble shooting? I’m getting this error from different email addresses.

I checked the API key - it’s correct
I disabled spam protection
I checked all the email addresses in the setup, they are correct.

thx

<22>Nov 30 00:47:01 postfix/smtpd[267]: connect from mail-io0-f176.google.com[209.85.223.176]
<22>Nov 30 00:47:01 postfix/smtpd[267]: NOQUEUE: reject: RCPT from mail-io0-f176.google.com[209.85.223.176]: 454 4.7.1 <replies+0f6bef48656c993dfbe4df4b5cdff0d6@reply.EL.fit>: Relay access denied; from=<theia@VF.fit> to=<replies+0f6bef48656c993dfbe4df4b5cdff0d6@reply.EL.fit> proto=ESMTP helo=<mail-io0-f176.google.com>
<22>Nov 30 00:47:01 postfix/smtpd[267]: disconnect from mail-io0-f176.google.com[209.85.223.176] ehlo=1 mail=1 rcpt=0/1 data=0/1 quit=1 commands=3/5
<22>Nov 30 00:50:09 postfix/anvil[262]: statistics: max connection rate 2/60s for (smtp:209.85.223.173) at Nov 30 00:44:21
<22>Nov 30 00:50:09 postfix/anvil[262]: statistics: max connection count 1 for (smtp:209.85.223.173) at Nov 30 00:40:08
<22>Nov 30 00:50:09 postfix/anvil[262]: statistics: max cache size 2 at Nov 30 00:42:15

MAIL_DOMAIN isn’t set to reply.EL.fit.

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EL = endurancelab . I redacted it

sorry… total Dummy

To bring closure to anyone else with this issue…

Here is my mistake:

MAIL_DOMAIN: discuss.endurancelab.fit
should he
MAIL_DOMAIN: reply.endurancelab.fit

MAIL_DOMAIN needs to match reply by email address

Thank you!!

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