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Sending MMS will compress the picture, it can also be restricted by your carrier/network, you can send the pictures through other messaging apps or upload them to box, drive, onedrive, dropbox and share the link to keep the original size/quality.
Which messaging app are you using?
Settings > apps > messaging > clear data > restart the phone > check again, also contact your carrier network regarding MMS size restriction.
Just wondering are you sending the actual picture or a thumbnail ?
Hi @Flo7777,
Welcome to the community.
I am sorry to hear about the issue you are facing. Can you please confirm if the images you are trying to send were taken with the camera or are they screenshots?
I have this same issue with my Sony Xperia XZ Premium when sending photos taken with my camera via txt. My wife receives them pixelated.