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Date: Wed, 8 Nov 2023 16:52:31 +0100 (CET)
From: Dietmar Maurer <dietmar@proxmox.com>
To: Proxmox VE development discussion <pve-devel@lists.proxmox.com>,
 Lukas Wagner <l.wagner@proxmox.com>
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Subject: Re: [pve-devel] [PATCH v4 many 00/11] notifications: add SMTP
 endpoint
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> This patch series adds support for a new notification endpoint type,
> smtp. As the name suggests, this new endpoint allows PVE to talk
> to SMTP server directly, without using the system's MTA (postfix).

Isn't this totally unreliable? What if the server responds with a 
temporary error code? (An MTA retries several times).