Hello,
I have a NAS (Synology) at home which runs my private IMAP server. In aquamail configuration I configured the DynDNS name for my router and a special port. All access to this port is forwarded to the NAS and a normal IMAP port.
Everything works fine, I can access the IMAP server at home (local WiFi), using mobil network or public WiFi.
However, when using a VPN connection to my router, Aquamail is not able to contact the IMAP server.
Again, everything else works fine with VPN. I can surfe the Web and I can connect devices in my local LAN.
Any idea, why Aquamail is not able to contact the IMAP server?