Wireguard and IMAP Problem

[nirmalts]

I managed to configure Wireguard with NordVPN and it works amazingly well. The only problem I face is that emails with IMAP does not work (for example, gmail etc). I have a second openVPN client with the same NordVPN server and if I switch to that it works fine, without having to change any firewall rules. Any clue what the problem could be?

Regards

[allebone]

If you google nordvpn imap/smtp issues its a known issue. Gmail etc try block vpn providers from accessing their services so you might have to change servers a few times on nordvpn to get one that works. Or you can google their official help for other suggestions.

[nirmalts]

Thanks @allebone. You are right, in general it could be because the email provider is blocking the VPN service.

As I wrote, I excluded this by creating a OpenVPN client with the same NordVPN server and the email receive/send works without any problem. Only if I use the WG client with the same VPN server, the problem appears.

Any hint on how I could troubleshoot this?

[nirmalts]

Also I tried the following which works.

Have a firewall rule which routes the ports,465, 587, 993 and 995 to either the OpenVPN Client or the WAN directly and let all other traffic go through WG client, which works well.

I would like to get rid of the OpenVPN client and also make sure all traffic goes through VPN (using the WG client). Therefore I do not prefer the options above.

[nirmalts]

Here's how my Rules and NAT look like now

[allebone]

Im not sure. Seems like it should work. i use wireguard and dont experience the same issues so Im not sure why you do.

[nirmalts]

Ah ok. You have NordVPN as well?

[nirmalts]

@allebone You were fully right. It is a NordVPN problem.
I took a Mullvad 1 month connection to test. Configured wireguard and everything works including IMAP/SMTP.

Thanks for your hint.

Now I have a 2 year NordVPN subscription to trade

[allebone]

No worries. You can probs get nord to work by keep changing servers until you find an ip thats not blocked. Maybe maybe not depends what ips are on the blocklist I guess.