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I gather you want to send them a photo as an email attachment, is that right? If so, and you have a smartphone, any pics you take with it should easily be way below the 5 Mb threshold. But photos you have on your computer can be resized using whatever image handling software you have like MS Paint for Windows, or Preview on a Mac. You could upload the image to a hosting site like Photobucket, or use a cloud service like iCloud or Google Drive etc.
I don't have an Android phone, but I have an iPhone. If I take a photo and then go to email it to someone, it will prompt me to choose a size like Small, Medium or Large. See if this applies to you------------------
Does the information at the link I posted above help you?