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CPANEL-36285 - Change in forwarder behaviour?

4u123
Hi, A client has recently reported an issue whereby forwarded Emails sent to several recipients that forward to the same mailbox are resulting in only one copy in the destination. Here's a simple explanation... Scenario... albert@domain.com betty@domain.com charlie@domain.com All three of these addresses forward to group@domain.com Until recently an Email sent to all three recipients would result in three Emails being sent to group@domain.comn - so three messages would arrive in the inbox - however, the client says recently this behaviour has changed - and an Email sent to all three recipients results in only one message being saved in the group@ mailbox. I'm not familiar with how the forwarder functionality has worked in the past, so I can't claim that this is the way it has always been. What I'm trying to determine is whether this is something that has changed within cpanel recently and to clarify exactly how this is handled within cpanel. We have mailscanner installed, so I don't know if this could potentially be a factor. I know that was updated recently. Any advice you can offer would be very welcome.

Comments

7 comments

Date Votes
  • cPRex Jurassic Moderator
    Hey there! I'm not aware of any changes to the forwarding system recently. Could you try disabling mailscanner to see if that changes the behavior?
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  • 4u123
    Hi Rex, so can you please confirm that the intended behaviour of the cpanel forwarders would be as follows... A single message sent to multiple recipients, each with a forwarder to the same account should result in multiple copies of the same message appearing in the destination mailbox.
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  • cPRex Jurassic Moderator
    Yes - that's exactly what I would expect to happen. If you're not seeing that happen when you perform a test on your side, just let me know and I can do some additional testing on my end with that :D
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  • 4u123
    Ok I've tested this with Mailscanner enabled and with it disabled. Each time, the target mailbox for the forwarders receives only one copy of the message. As you can see, this message was sent from myaddress@domain1.com to nicole@domain2.com info@domain2.com and marie@domain2.com. Each of those has a forwarder to group@domain2.com but only one message was delivered there. Note that SRS is enabled. [QUOTE] 2021-03-18 09:06:48 1lMocC-0000UN-Kv H=myserver.myserver.net [x.x.x.x]:42114 Warning: Message has been scanned: no virus or other harmful content was found 2021-03-18 09:06:48 1lMocC-0000UN-Kv <= myaddress@domain1.com H=myserver.myserver.net [x.x.x.x]:42114 P=esmtps X=TLS1.2:ECDHE-RSA-AES256-GCM-SHA384:256 CV=no S=6872 id=348b512f-a343-6f22-6584-b25d21616765@domain1.com T="Fwd: Fwd: Test Email, please ignore" for info@domain2.com marie@domain2.com nicole@domain2.com 2021-03-18 09:06:48 cwd=/var/spool/exim 3 args: /usr/sbin/exim -Mc 1lMocC-0000UN-Kv 2021-03-18 09:06:48 1lMocC-0000UN-Kv => info R=virtual_user T=dovecot_virtual_delivery C="250 2.0.0 gKVDLSgYU2BtbQAAdcpwUA Saved" 2021-03-18 09:06:48 1lMocC-0000UN-Kv -> group (info@domain2.com) SRS= R=virtual_user T=dovecot_virtual_delivery C="250 2.0.0 gKVDLSgYU2BtbQAAdcpwUA:2 Saved" 2021-03-18 09:06:48 1lMocC-0000UN-Kv -> marie R=virtual_user T=dovecot_virtual_delivery C="250 2.0.0 gKVDLSgYU2BtbQAAdcpwUA:3 Saved" 2021-03-18 09:06:48 1lMocC-0000UN-Kv -> nicole R=virtual_user T=dovecot_virtual_delivery C="250 2.0.0 gKVDLSgYU2BtbQAAdcpwUA:4 Saved" 2021-03-18 09:06:49 1lMocC-0000UN-Kv => |/usr/local/cpanel/bin/autorespond nicole@domain2.com /home/username/.autorespond (nicole@domain2.com) SRS= R=virtual_aliases_nostar T=cagefs_virtual_address_pipe 2021-03-18 09:06:49 1lMocC-0000UN-Kv Completed
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  • cPRex Jurassic Moderator
    Thanks for the clear details :D I tested this on my end and confirmed this behavior on my end, so I have created case CPANEL-36285 with our developers so they can look into this. I'll be sure to update this case with any additional information as I get updates.
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  • 4u123
    Thanks Rex. I've looked through the logs for the last month and I've been unable to find a single instance of the message being received multiple times into the group@ mailbox, leading me to believe the client is wrong about how this may have worked previously. If your internal case proves that the single copy is the intended behaviour and this hasn't changed recently, I'd be fine with that. It does seem logical to forward only one copy of the message. Would like to know conclusively.
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  • cPRex Jurassic Moderator
    I'm interested to see what they say too. I phrased my wording as this being not the intended behavior, as I couldn't find any details about a change. You can follow along on this page here if you are signed in to our ticket system: cPanel
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