It’s Mailchimp, not MailChimp. It used to be MailChimp, but they changed it to Mailchimp.
Not Marie Celeste.
Takes apostrophe-s and is not capitalised.
media, medium, mediums
Strictly speaking, media (as in mass media, social media, etc.) is a plural. It’s the plural of medium. It’s now widely used as a singular word, like data. It’s best to avoid the plural form mediums unless you’re referring to spiritualists or psychics.
Initial cap both words.
- West Midlands – initial cap both words because it’s a county.
- east Midlands – lower case E because it’s not a county or administrative district.
- East Midlands Airport – initial cap every word because it’s a proper noun.
Sometimes people talk of a “mute point” or they talk of an idea being “muted”. They mean moot, and mooted.
- Mute means silent, or refraining from speech, or not expressed in speech; and in this day and age the word is commonly used in the sense of muting your microphone in a video call. There is also a kind of swan called a mute swan (so called because it’s less vocal than other species of swan).
- Moot is an adjective meaning debatable or questionable. It’s also a verb meaning to raise a topic for discussion or suggest an idea. (“A business rate rise for higher-value properties is being mooted”.)