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  • 1.  Emails blocked

    Posted Dec 28, 2021 12:26 PM
    Hello,

    the emails that we are sending to .messagelabs.com being blocked with the following messages :

    <-- 553-DMARC domain authentication fail. Refer to the
    <-- 553-Troubleshooting page at https://knowledge.broadcom.com/e
    <-- 553-xternal/article?legacyId=TECH246726 for more
    <-- 553 information. (#5.7.1)

    Sometimes emails received, sometimes not. It's not a permanent error.

    Emails have good DKIM sign and verified DMARC record. Others email providers accept that emails without errors.

    Kindly help to resolve.


  • 2.  RE: Emails blocked

    Posted Jan 20, 2022 10:52 PM
    My client is complaining of fail to their overseas partner> i checked our Mdaemon log as per error below. Please why I received error below. Please advise

    thanks



    *  Connection established 123.176.73.72:65169 --> 54.83.87.114:25

      Waiting for protocol to start...

      <-- 220 mail555.messagelabs.com ESMTP Wed, 19 Jan 2022 00:49:11 +0000

      --> EHLO angel.samoa.net.ws

      <-- 250-mail555.messagelabs.com Hello angel.samoa.net.ws [100.112.12.210]

      <-- 250-SIZE 52428800

      <-- 250-8BITMIME

      <-- 250-PIPELINING

      <-- 250-PIPE_CONNECT

      <-- 250-CHUNKING

      <-- 250-STARTTLS

      <-- 250-PRDR

      <-- 250 HELP

      --> STARTTLS

      <-- 220 TLS go ahead

      SSL negotiation successful (TLS 1.2, 256 bit key exchange, 256 bit AES encryption)

      SSL certificate is valid (matches cluster1a.us.messagelabs.com and is signed by recognized CA)

      --> EHLO angel.samoa.net.ws

      <-- 250-mail555.messagelabs.com Hello angel.samoa.net.ws [100.112.12.210]

      <-- 250-SIZE 52428800

      <-- 250-8BITMIME

      <-- 250-PIPELINING

      <-- 250-PIPE_CONNECT

      <-- 250-CHUNKING

      <-- 250-PRDR

      <-- 250 HELP

      --> MAIL From:<LDM@transworks.ws> SIZE=3558

      <-- 250 OK

      --> RCPT To:<takeo.ouchi.23@mhi.com>

      <-- 421 Service Temporarily Unavailable

      --> QUIT




  • 3.  RE: Emails blocked

    Broadcom Employee
    Posted Jan 21, 2022 04:35 AM
    It looks like your server is not correctly selecting the target MX record to send to, in accordance with RFC 5321.


  • 4.  RE: Emails blocked

    Broadcom Employee
    Posted Jan 21, 2022 04:37 AM
    Please check the DNS configuration for the target domain - i.e. who the email is actually addressed to, using a tool such as viewdns.info.  These kind of intermittent problems can occur when some of the DNS servers for the domain are incorrectly configured or are unreachable.