Why am I being charged to send e-mails with pictures in them?

Please answer quickly if you can, this is kinda urgent sorry… So i have a monthly contract which allows me unlimited texts, so i get that i can't send picture texts, but to keep sending pictures to people i send them by email, but now, i get charged 25p to send an e-mail, which i think isn't fair, so does anyone know why this is happening? Btw, i have an iPhone 5 on t-mobile and EE as the carrier.

E-mails are categorized as usage of DATA or the internet and your plan may not cover internet usage ( I may be wrong as I do not use T-mobile but AT&T )

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