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Invalid HELO name, Reverse DNS does not match SMTP Banner

unigen
Hi, Below is the result of this command exigrep dips@otherdomain.in /var/log/exim_mainlog 2019-04-25 04:39:40 1hJWAX-0002fl-Pd ** dips@otherdomain.in R=dkim_lookuphost T=dkim_remote_smtp H=otherdomain.in [103.21.58.231] X=TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256 CV=no: SMTP error from remote mail server after pipelined MAIL FROM: SIZE=2315: 550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1)
mxtoolbox "Test email server" test for SMTP Banner Check shows Reverse DNS does not match SMTP Banner error. Reverse DNS, PTR, SPF, DKIM, everything is checked correct. I'm able to send to gmail but not other domains. How do I fix this? I have some 15 domains running on Cpanel/WHM VPS server, and while I do have root access, I'm inexperienced with linux commands. Therefore I'm looking for any solution using Cpanel/WHM. Thank you! Dips.

Comments

26 comments

Date Votes
  • cPanelLauren
    Is the hostname of the server the same as the rDNS? Meaning does the Primary IP of the server resolve to the current hostname of the server? You can find what the rdns is by running something like the following: host
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  • unigen
    [root@example-vps-sg ~]# host 103.125.xxx.xx xx.xx.125.103.in-addr.arpa domain name pointer sg.example.net.
    So this is correct
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  • cPanelLauren
    And when you do the following do you get the IP address of the server? dig a sg.example.net +short
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  • unigen
    There's no output to the above command. [root@example-vps-sg ~]# dig sg.example.net +short [root@example-vps-sg ~]#
    I typed the command again and it did give the IP [root@example-vps-sg ~]# dig a sg.example.net +short 103.125.xxx.xx
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  • unigen
    I just noticed that something must have changed on the server. I've been struggling with this issue for last 3 days but today the mail does go. Only it lands in the spam/junk folder.
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  • cPanelLauren
    Hi @unigen I'm really glad to hear that mail is working once more. For the issue with it going to spam you may want to check the advice provided here: How to Keep your Email Out of the Spam Folder - cPanel Knowledge Base - cPanel Documentation Thanks!
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  • unigen
    Hi @
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  • cPanelLauren
    Hi @unigen Is anything of note added in the exim main log when you attempt to send mail? How many emails are in the exim queue? exim -bpc
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  • unigen
    [root@example-vps-sg ~]# exim -bpc 20
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  • cPanelLauren
    Great and as far as anything noted in the exim logs when attempting to send mail?
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  • unigen
    If the following offers any insights, here's the output of test run on SMTP Check - Pingability.com: DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle] DEBUG SMTP: useEhlo true, useAuth true DEBUG SMTP: trying to connect to host "mydomain.com", port 25, isSSL false 220-example-vps-sg ESMTP Exim 4.91 #1 Thu, 02 May 2019 15:53:44 +0000 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail. DEBUG SMTP: connected to host "mydomain.com", port: 25 EHLO localhost 250-example-vps-sg Hello pingability.com [72.249.37.67] 250-SIZE 52428800 250-8BITMIME 250-PIPELINING 250-STARTTLS 250 HELP DEBUG SMTP: Found extension "SIZE", arg "52428800" DEBUG SMTP: Found extension "8BITMIME", arg "" DEBUG SMTP: Found extension "PIPELINING", arg "" DEBUG SMTP: Found extension "STARTTLS", arg "" DEBUG SMTP: Found extension "HELP", arg "" DEBUG SMTP: use8bit false MAIL FROM: 550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1) DEBUG SMTP: got response code 550, with response: 550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1) RSET DEBUG SMTP: EOF: [EOF] DEBUG SMTP: MessagingException while sending, THROW: com.sun.mail.smtp.SMTPSendFailedException: 550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1) ; nested exception is: com.sun.mail.smtp.SMTPSenderFailedException: 550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1) at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:2358) at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1823) at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1300) at com.rimuhosting.util.email.EmailDetails.sendEmail(EmailDetails.java:579) at com.rimuhosting.util.email.EmailDetails.sendEmail(EmailDetails.java:396) at org.apache.jsp.smtptest_jsp._jspService(smtptest_jsp.java:336) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:476) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329) at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at com.rimuhosting.util.webrequest.DoNothingFilter.doFilter(DoNothingFilter.java:94) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:668) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) at org.apache.coyote.ajp.AjpProcessor.service(AjpProcessor.java:394) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.base/java.lang.Thread.run(Thread.java:834) Caused by: com.sun.mail.smtp.SMTPSenderFailedException: 550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1) at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1832) ... 35 more QUIT DEBUG SMTP: EOF: [EOF] SMTPSenderFailedException: 550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1)
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  • cPanelLauren
    At this point it may be best to confer with your provider if you don't have root access to the system. They'll be able to investigate items that as a reseller you won't be able to. Thanks!
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  • unigen
    I do have root access, just don't know what I'm supposed to do. Following is result of exiqgrep for the domain. [root@example-vps-sg log]# exiqgrep -r @example.in perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = (unset), LC_ALL = (unset), LC_CTYPE = "UTF-8", LANG = "en_US.UTF-8" are supported and installed on your system. perl: warning: Falling back to a fallback locale ("en_US.UTF-8").
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  • cPanelLauren
    Hi @unigen In that case, since it looks like you have more than just issues with sending mail on the server (that error really shouldn't be occurring) I believe it's best you open a ticket with us using the link in my signature. Once open please reply with the Ticket ID here so that we can update this thread with the resolution once the ticket is resolved. Thanks!
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  • unigen
    Hi
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  • cPanelLauren
    Hi @unigen Great! I'm watching that ticket now and it looks like an analyst is actively working on it. I'll update here when the issue is resolved. Thanks!
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  • unigen
    Hi @cPanelLauren, It took a while but the issue was finally resolved. The culprit was server hostname inconsistency. However, once I changed the hostname using the WHM utility, everything was sorted and there was no error when sending emails. Thank you!
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  • Jose Luis Silva
    @cPanelLauren, Hi, i have exactly the same error with mi WHM server, when i login by ssh a long advert about perl locale. Can you sayme what i should do, please? Thanks in advance.
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  • cPanelLauren
    Hello @Jose Luis Silva Can you show me an example of the exact error you're receiving?
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  • Fabricio Galdino
    Hello Everybody! I've the same issue. In my case,I change the hostname by WHM interface and everything stay ok, but when I reboot the server, the problem come back. Someone can help me fix this issue permanently?
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  • cPanelLauren
    Hello Everybody! I've the same issue. In my case,I change the hostname by WHM interface and everything stay ok, but when I reboot the server, the problem come back. Someone can help me fix this issue permanently?

    Hello, This sounds like an issue that we commonly see on Virtuozzo VPS's where the hostname needs to be added to the container from the host node. You need to let your provider know to update the container name so it stops going back to what they have set for the default.
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  • Fabricio Galdino
    Hello! @cPanelLauren Thank you for reply. I'm using OVH datacenter and my Cpanel is a docker running on Proxmox Environment. Do you know if this tips applie to the same situation? Best Regards!
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  • cPanelLauren
    I'd assume so @Fabricio Galdino though I am admittedly not nearly as familiar with that configuration. OVH should be able to assist you with this if you don't have the access to modify it.
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  • Fabricio Galdino
    Hey @cPanelLauren, Thank you for the tip. I'm running the Cpanel on docker and when I changed the hostname in management system, everything work well. Best regards!
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  • cPanelLauren
    Hi @Fabricio Galdino I'm really happy to hear you got it sorted! Thank for letting us know.
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  • Burti
    Hello @cPanelLauren , In v86.0.17 Thats my exim conf: And I see /etc/mailhelo file x.com has in. And x.com have dedicated ip (ex:192.168.2.1) 192.168.2.1 -> RDNS -> mail.x.com But when I sent mails HELO going with default hostname. Am I missing something? Regards. #stayhome ?
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