Duplicate mails received for voice mail notification

[ACSO]

Hello,

we have one user who is receiving multiple emails notifications for the same voice mail.
Email headers are different each time and email comes from 3cx smtp with voice mail message attached.

Here are 2 excerpts of headers but user can receive 20 emails notifications (this started happening end of last week).

Is there anything wrong with 3CX smtp servers ? No problem on other installations ...

Received: from smtp-proxy.3cx.net (unknown)
    by ismtpd0002p1lon1.sendgrid.net (SG) with ESMTP id 7o98Up9GSCmm2ZlXsGJqyA
    for <[email protected]>; Mon, 31 Aug 2020 12:32:54.164 +0000 (UTC)
From: "3CX Phone System - =?utf-8?B?Q29tbXVuZSBkZSBTYWludCBMZXUgZCdFc3NlcmVudA==?=" <[email protected]>
Date: Mon, 31 Aug 2020 12:45:14 +0000
Subject: Nouveau message vocal 01xxxxxxxx - 01xxxxxxxx
Message-ID: <6SDDKGOVJBU4.F9ZR5ZTTNAXS@SRV-3CX>

Received: from smtp-proxy.3cx.net (unknown)
    by ismtpd0002p1lon1.sendgrid.net (SG) with ESMTP id f2zX3iEeQ620dmlEXH1HUg
    for <[email protected]>; Mon, 31 Aug 2020 12:49:57.596 +0000 (UTC)
From: "3CX Phone System - =?utf-8?B?Q29tbXVuZSBkZSBTYWludCBMZXUgZCdFc3NlcmVudA==?=" <[email protected]>
Date: Mon, 31 Aug 2020 12:52:12 +0000
Subject: Nouveau message vocal 01xxxxxxxx - 01xxxxxxxx
Message-ID: <MALLT5TVJBU4.FVEPC4P7ZQGO@SRV-3CX>

Received: from smtp-proxy.3cx.net (unknown)
    by ismtpd0006p1lon1.sendgrid.net (SG) with ESMTP id 04hUYUKuQ9COFjXZesr1hg
    for <[email protected]>; Mon, 31 Aug 2020 14:16:13.557 +0000 (UTC)
From: "3CX Phone System - =?utf-8?B?Q29tbXVuZSBkZSBTYWludCBMZXUgZCdFc3NlcmVudA==?=" <[email protected]>
Date: Mon, 31 Aug 2020 14:22:03 +0000
Subject: Nouveau message vocal 01xxxxxxxx - 01xxxxxxx
Message-ID: <J5UUTXGWJBU4.4143GPM7311M3@SRV-3CX>

 

[JohnS_3CX]

Hi,

Kindly read this post and provide all the relevant info
https://www.3cx.com/community/threads/information-to-provide-when-requesting-help.67558/

 

[ACSO]

Sorry ! Here they are :

• 3CX Version : Professional Annual 16.0.5.619
• Server OS, Windows 2012 R2
• Is the 3CX Server Hosted and where? no, on premise
• IP Phone Make/Model/Firmware : Yealink T2X
• Provisioning Method: Local
• Trunk Provider or Gateway Make/Model : Trunk sip generic
• Has the Firewall Checker passed: yes
• Are custom Phone Templates being used: no

 

[AWS2P]

2012 server is no more supported, you need to update latest v16 SP6 but first you need to change OS

 

[JohnS_3CX]

Thanks. As far as the voicemails go, do they belong to an extension (ie I leave a voicemail for EXT 100) or do they belong to a ring group / queue mailbox?

It's possible that the duplicate voicemails may be legit if for example you added 4 extensions to a ring group and they all have the same email as destination

 

[ACSO]

Yes it belongs to an extension, the user receives 20-25 mail notifications on its mailbox, each unique.
Since it seems there are difficulties reaching the 3CX admin from a different location it may be that it is the same for the smtp email sending, 3cx server is retrying again and again (attachments have different sizes ...) and smtp connection drops sending data, I'm investigating the matter (it is behind a pfsense).

 

[ACSO]

2012 server is no more supported, you need to update latest v16 SP6 but first you need to change OS

Sorry it is a Windows 2019, I know Windows 2012 is not supported anymore, I have one left to upgrade to debian

 

[JohnS_3CX]

Thanks this is interesting indeed, let us know how it goes.