Can't receive email from a specific website. Error 450 4.1.7

OS type and version: Ubuntu 18.04 LTS
Webmin version: 1.981
Virtualmin version: 6.16
Related products version: Postfix 3.3.0

I’m trying to receive a password reset email from a website Say my account is I’m getting the following logged into mail.log when requesting a password reset mail.

Sep 18 20:56:33 primary postgrey[1471]: action=pass, reason=triplet found,, client_address=,,
Sep 18 20:56:33 primary postfix/smtpd[15358]: NOQUEUE: reject: RCPT from[]: 450 4.1.7 <>: Sender address rejected: unverified address: host[] said: 550-5.1.1 The email account that you tried to reach does not exist. Please try 550-5.1.1 double-checking the recipient's email address for typos or 550-5.1.1 unnecessary spaces. Learn more at 550 5.1.1  ht; from=<> to=<> proto=ESMTP helo=<>

Not sure why this is happening. I am getting mails from other places. Even one from (not the password reset). Why is this mail not getting delivered. Please help.

Has this Virtualmin been configured to use the Mailgun API to verify email addresses before sending / accepting mail? Note that such a check could be part of a third party anti-spam software that has been installed.


I don’t have mailgun installed. I wonder if postfix is sending an email back or somewhere else and its getting a bounce from there? I’m not sure what postfix is doing here.

Only these 2 lines are added to the logs when requesting the reset email. Could there be any other log file with more information?

Looks like maybe the email address got added to a greylist file.

look in the /etc/postfix directory to see if you see anything

You can add the email address to a whitelist. I’m not sure of the format of adding email addresses.

Its not getting whitelisted. I don’t get these mails at all. Greylisted mails do arrive after some time.

Are you sure? This is part of your error message: helo=<>

Its not a free software. Pretty sure I didn’t pay them hahaha

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