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Some incoming e-mails are not delivered

postcd
Hello, i tried to use yahoo, centrum.cz, bitmessage.ch free mailboxes to send e-mail to couple of my cPanel accounts on my WHM server. Previously i have not noticed problems with mail delivery, but now i see i do not receive some e-mails. I checked the server logs: cd /var/log;grep -E "yahoo|centrum|bitmessage|mycpaneldomain1|mycpaneldomain2" maillog exim_mainlog and i found delivery from some servers, but not from those that i mentioned above. Unsure if that two logfiles are everything i need to check. i asked centrum.cz admin if they can send me details on delivery failure cause yahoo shown delivery failure e-mail but after studying its headers/source code i have not found any reason beside nothing saying "Unable to deliver message after multiple retries, giving up." bitmessage shows: "Error Type: SMTP Error Description: Unable to find the recipient's email server. The DNS query has failed." I checked and the cPanel VPS is using Google DNS and VPS host server is using opennic NSs in /etc/resolv.conf: nameserver 185.121.xxx.xxx nameserver 185.121.xxx.xxx they seem to work. When i disabled ConfigServerFirewall (csf -x) and tried to send e-mail again, the e-mails reached the mailserver as per

Comments

7 comments

Date Votes
  • Infopro
    This site might be helpful to do a quick check of an email account on your server: Newsletters spam test by mail-tester.com
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  • postcd
    Thanks, but i do not think it helps me in any way. If the mail would be denied by my server as a spam, i would see it in logs right? I got score 6/10 on that site, "The famous spam filter
    0
  • Infopro
    Mail to you, is failing, as I understand your post. I'm unable to assist you using opennic, I don't know anything about it.
    0
  • postcd
    i see, i will need to wait for other cPanel staff or member and also i am searching Google for possible ways in the meantime.
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  • cPanelMichael
    When i disabled ConfigServerFirewall (csf -x) and tried to send e-mail again, the e-mails reached the mailserver as per CSF Possibly Blocking Gmail - ConfigServer Community Forum Thank you.
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  • postcd
    This suggests the issue relates to a CSF configuration value.

    Thank you for your reply. I read yours linked topic, they suggest IPv6 enable, but my VPS does not support IPv6 at all. Moreover i do not believe firewall blocked the mailserver IPs because i went thru the logs as i mentioned. And i did it again just now and i see there was just like 3 permanent firewall blocks for last 3 days and there are only 4 temporary IP blocks, i checked these few IPs in whois to see its owner and detail and these are not mail servers. Though, out of 3 e-mails i sent before 20 minutes (from bitmessage freemail, centrum.cz freemail, yahoo.com freemail) only one appeared in logs for last 20 minutes since i sent e-mails. Others not appeared, not delivered. The one that appeared in logs was marked as spam: ""SpamAssassin as cpusernamehere detected message as spam (8.4)"" - by the way this seems strange to me, because my subject was: testab, body was: testab I believe such testing e-mail should be delivered and i am curious how i can setup SpamAssassin not to mark such testing e-mails as SPAM. Other question is why it not delivered other two e-mails and there i ask if anyone is willing to suggest some approach on how to test the things and discover cause. Offcourse i would be very grateful and it may help me and other people in future.
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  • cPanelMichael
    Hello, You may also want to review /var/log/exim_rejectlog to see if there are any entries there for the emails that were not delivered. EX: exigrep user@domain /var/log/exim_rejectlog
    Additionally, this thread is a useful reference: I encourage you to open a separate thread for additional issues (e.g. SpamAsssasin rules) unrelated to this particular topic so we can better assist you. Thank you.
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