Cannot send email from pop account when in 3G, will send in WIFI

I cannot send email from pop account when in 3G, will send in WIFI.
I thought it was the SMTP server first.. but when i config my WIFI, suddenly the emails that i tried to send, left my outbox and sent.
Any idea's

The SMTP server you are using with Wi-Fi would be the outgoing server of your internet service provider... this is likely why that's working.
SMTP servers specific to a ISP would not work on the 3G network. You would probably need another SMTP server. One from your cell provider?

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