Why are my emails not sending?

I'm on holiday in Spain. My mum has connected both my iPad and my my iPhone to the villa's Wi-Fi. We're out at the moment, but I'm still connected to the web. The emails that are sent to me will often still come through to my email address, but I'm still unable to actually send emails, no matter where I'm. Please help.
Thank you. Any good answers that I may get will mean a lot to me so thanks in advance.

You are sending emails from "yourname@ukserver.co.uk", and you are logged into "Spanishserver.com", which won't accept your mails. Always a snag with POP mail. The answer is to use webmail like gmail, which does let you send stuff from any account you use

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