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Amazon SES SMTP Forwarder email sender rejected AUP#CDRBL

David

The entire domain uses Amazon SES SMTP relay to send emails, and only when using a forwarder, some of the emails sent will prompt the sender to reject AUP#CDRBL.
1. My mail server has always used Amazon SES to send emails, but some emails are automatically forwarded to Zendesk ticket emails using a forwarder, but the sender is still prompted to reject AUP#CDRBL. Not all forwarded emails prompt CDRBL, only a few.
2. The mail server IP is still included in UCEPROTECTL3. Some individual emails are forwarded through Amazon SES, prompting the sender to reject AUP#CDRBL. Does this have something to do with the mail server IP being included in UCEPROTECTL3?

 

Comments

4 comments

Date Votes
  • cPRex Jurassic Moderator

    Hey there!  In 2024 I'm hoping that most mail providers don't take UCEProtect seriously, but some still do.

    Do you see that you are on any other blacklists with you check with a tool like MXToolbox?

    Ultimately, this isn't something you'll be able to fix on the cPanel side of things.

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  • David

    1. The mail server IP is still included in UCEPROTECTL3.
    2. All our domain names use Amazon SES relay service to send mail.
    The problem now is that only when the Amazon SES relay service forwarder automatically forwards mail will it prompt sender rejected AUP#CDRBL. If the forwarder does not forward mail, there will be no AUP#CDRBL prompt.
    2. When using Amazon SES relay service to send mail normally, there will be no AUP#CDRBL prompt.
    I don't know where this problem is now?

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  • cPRex Jurassic Moderator

    Since the mail itself is coming from the Amazon server in either condition, it would be best to speak with them first since they have full control of that relay service.

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  • David

    2024-07-18 03:08:46 1sUA17-00000001m98-2ZiX <= amberrob*****@gmail.com H=mail-ot1-f41.google.com [209.85.210.41]:52468 P=esmtps X=TLS1.3:TLS_AES_128_GCM_SHA256:128 CV=no S=47797 id=CAPG+_rARAhE8CrJfPyWBwwjd7JKBe2tDH69u0y6+2ejMgoWr7g@mail.gmail.com T="Re: [AKASO] Pending request: EK7000 Pro YJ-UK 2024-02-19 it had a\n slow leak from somewhere and took" for **@akasotech.com 2024-07-18 03:08:46 cwd=/var/spool/exim 3 args: /usr/sbin/exim -Mc 1sUA17-00000001m98-2ZiX 2024-07-18 03:08:46 SMTP connection from mail-ot1-f41.google.com [209.85.210.41]:52468 D=41s closed by QUIT 2024-07-18 03:08:46 1sUA17-00000001m98-2ZiX => cs <****@akasotech.com> R=virtual_user T=dovecot_virtual_delivery C="250 2.0.0 <****@akasotech.com> gKZ3DL4WmGbjdQYAOtl5Ug Saved" 2024-07-18 03:08:46 1sUA17-00000001m98-2ZiX [54.157.237.25] SSL verify error: certificate name mismatch: DN="/C=US/ST=California/O=Proofpoint, Inc./CN=*.smtp.a.cloudfilter.net" H="email-smtp.us-east-1.amazonaws.com" 2024-07-18 03:08:48 1sUA17-00000001m98-2ZiX ****@akasohelp.zendesk.com (**@akasotech.com) <**@akasotech.com> R=send_via_ses T=ses_forwarded_smtp H=email-smtp.us-east-1.amazonaws.com [54.157.237.25] X=TLS1.2:ECDHE-RSA-AES256-GCM-SHA384:256 CV=no: SMTP error from remote mail server after MAIL FROM:<SRS0=3a67=or=gmail.com=amberrob*****@akasotech.com> SIZE=49683: 550 UA18shYdpRn6WUA19sUYWt - <srs0=3a67=or=gmail.com=amberrob****@akasotech.com> sender rejected AUP#CDRBL 2024-07-18 03:08:48 cwd=/var/spool/exim 7 args: /usr/sbin/exim -t -oem -oi -f <> -E1sUA17-00000001m98-2ZiX 2024-07-18 03:08:48 1sUA1A-00000001m9Q-2Pqn <= <> R=1sUA17-00000001m98-2ZiX U=mailnull P=local S=50371 T="Mail delivery failed: returning message to sender" for amberrob*****@gmail.com 2024-07-18 03:08:48 cwd=/var/spool/exim 3 args: /usr/sbin/exim -Mc 1sUA1A-00000001m9Q-2Pqn 2024-07-18 03:08:48 1sUA17-00000001m98-2ZiX Completed 2024-07-18 03:08:49 1sUA1A-00000001m9Q-2Pqn ** amberrob*****@gmail.com R=send_via_ses T=ses_smtp H=email-smtp.us-east-1.amazonaws.com [54.157.237.25] X=TLS1.3:TLS_AES_256_GCM_SHA384:256 CV=yes: SMTP error from remote mail server after MAIL FROM:<>: 501 Invalid MAIL FROM address provided 2024-07-18 03:08:49 1sUA1A-00000001m9Q-2Pqn Frozen (delivery error message)

    How to solve the problem that the email cannot be returned to the original sender when using Amazon SES relay service and enabling SRS?

    ses_smtp: 
      driver = smtp 
      port = 587 
      hosts_require_auth = * 
      hosts_require_tls = *

    .ifdef SRSENABLED
      ses_forwarded_smtp:
        driver = smtp
        hosts_require_auth = *
        hosts_require_tls = *
        max_rcpt = 1
        return_path = ${srs_encode {SRS_SECRET} {$return_path} {$original_domain}}
    .endif

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