You could have 20,000 people on your mailing list but if only 0.2% are opening and reading it you are just adding to the digital clutter.
Gallech gael 20,000 o bobl ar eich rhestr bostio ond os mai dim ond 0.2% sy'n ei hagor a'i darllen rydych chi'n ychwanegu at y annibendod digidol.