While connected to Wi-Fi, intended recipients do not receive my sent emails. Sent emails are shown sent in the Sent folder both in my desktop Thunderbird client and the web client directly linked to my email server. My SMTP settings are correct, and when on mobile data, rather than Wi-Fi, emails are received by intended recipients. I have tested this on multiple networks, with various providers, and have also attempted on a VPN connection to eliminate my IP address as an issue.