Why Does Email Work on Wi-Fi but Fail on a Mobile Network?

Email access can vary between Wi-Fi and mobile data because of VPN routing, DNS, firewall policy, carrier filtering, or mail app account configuration. The mailbox itself may be available while one network path is blocked.

What to check

Compare incoming and outgoing server names, ports and encryption, DNS answers, VPN state, carrier network behavior, and the exact error. Test webmail as a control and avoid repeatedly changing account passwords without evidence.

Recommended next step

Correct the affected connection or network rule and use provider-supported settings. Verify both sending and receiving on each relevant network after changes.

How Informatix Systems can help

Informatix Systems provides business email, DNS, and network support services. We can assess the affected workflow, trace the likely failure point, and help plan a practical resolution. Contact us with the system involved, when the issue began, and non-sensitive error details.