Sick mail
You're referring to a "sick email"!
A sick email is a humorous or sarcastic email that is sent to a friend, family member, or colleague when you're feeling under the weather or need a break. The email is often used to inform the recipient that you're not feeling well and won't be able to attend a meeting, event, or social gathering.
Here's an example of a sick email:
Subject: Out sick
Dear [Name],
Unfortunately, I've come down with a bad case of [insert fake illness here, e.g. "the flu," "a cold," or "a mysterious virus"]. I'm not feeling well enough to come into work/school/social event today, and I'll need to take the day to rest and recover.
I apologize for any inconvenience this may cause and will catch up with you when I'm feeling better.
Best, [Your Name]
Sick emails can be a fun way to poke fun at the seriousness of being sick and can also be a good way to communicate with others when you're not feeling well. Just be sure to keep the tone light and playful, and avoid sending a sick email to someone who might be genuinely concerned about your health!