Can't send mail

[Citizen X]

Message comes back undeliverable if connected to LAN but if using 3G it sends.

Any help would be appreciated. Thanks

 

[evti]

It may be mail server settings of your LAN provider. Try contacting them.

 

[AnonymouseUser]

Definitely need more info here.

Is this a smartphone, tablet, or laptop?
What email provider are you using?
What 3G provider and what ISP?
Are you using the default DNS servers per provider, or are you manully entering your own?
Has this ever worked in the past, or is this the first time you're trying it?

 

[corkyg]

Check your LAN SMTP setting.