Apple Mail is not working correctly without the use of a VPN.

ever since about one week, my Apple Mail is not working, when my VPN is off.

the problem occurs with only one of my email accounts.

when I enable the VPN, from outside Europe to a server to a server inside Europe, such as Amsterdam, the Netherland, Apple Mail will work normally.

this problem does not occur in webmail.

the problem exists both on my iPhone and on my MacBook Air, which are both fully updated.

I did check all the settings and they are correct.

in other words, Apple Mail cannot communicate with the required imap and smtp servers from outside Europe.

hopefully you can help me.