Vesta Server is rejecting valid emails

[americanninja]

I'm hoping someone can help me with the below. I noticed that some emails were not being received by my mail server. I run VestaCP for both my websites and as my mail server. I've been running this server for years now without any issue. Today, I was trying to reset my password on Glassdoor.com, however, I wasn't receiving the password reset email. I figured something must be an issue on my end.

So I logged into my server and ran this command to monitor the mail activity:
tail -f /var/log/exim4/mainlog

Sure enough, when I went back to glassdoor to request another password reset email, I saw the below entries added to the log file (I edited/sanitized some of the information) I swapped out my email and domain with "name" and "mydomain":

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2021-01-31 22:37:32 H=o4.mail8.glassdoor.com [50.31.56.142] X=TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256 CV=no F=<bounces+361255-f450-name=[email protected]> rejected RCPT <[email protected]>: Rejected because 50.31.56.142 is in a black list at bl.spamcop.net

2021-01-31 22:37:32 TLS error on connection from o4.mail8.glassdoor.com [50.31.56.142] (recv): The TLS connection was non-properly terminated.

2021-01-31 22:37:32 TLS error on connection from o4.mail8.glassdoor.com [50.31.56.142] (send): The specified session has been invalidated for some reason.

2021-01-31 22:37:32 unexpected disconnection while reading SMTP command from o4.mail8.glassdoor.com [50.31.56.142] D=0s

2021-01-31 22:40:28 H=o4.mail8.glassdoor.com [50.31.56.142] X=TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256 CV=no F=<bounces+361255-f450-name=[email protected]> rejected RCPT <[email protected]>: Rejected because 50.31.56.142 is in a black list at bl.spamcop.net

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Can someone help me understand the above. As far as I can tell, it appears as though my mail server is rejecting the email from glassdoor. But I have no idea why. I even checked the IP address listed above (the 50.xx.xx.xx), which I assume is Glassdoors and it does not show up on spamcop's website as blacklisted. So I have no idea what's going on, but it seems this is not limited to glassdoor.com. Other valid websites are being blocked by my email server.

Am I interpreting these error messages correctly? And can someone help me understand why my server is blocking them? Do I need to change some setting on my spam settings?

Thanks in advance!

[soguor]

Hi!
spamcop.net shows the 403 Forbidden error.

I resolve editing /etc/exim4/dnsbl.conf

Code: Select all

sudo nano /etc/exim4/dnsbl.conf

comment the line bl.spamcop.net

Code: Select all

#bl.spamcop.net

Restart exim4 and spamassassin services.
While I'm waiting to spamcop resolved the problem

[americanninja]

Thanks Soguor!

A follow-up question for you. So was your recommendation just a temporary fix until spamcop could resolve their issue?

If so, is there a need to still do this, or have you removed your disabled comment line now?

Thanks!