Maybe its not mailcow, but the host where mailcow runs on, or other containers? I don’t have any rsync connections open.

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Are you using custom sigs for ClamAV? Those target URLs are Sanesecurity rsync mirrors.

    4 days later

    accolon Actually no custom sigs, it is a clean mailcow installation on ubuntu 23.04 VM on Proxmox., but it seems that it indeed tries to connect to these mirrors.

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