Emails with too many typos or excessive punctuation, research finds, could make you look apathetic or girly.
To come to the conclusion, Frank McAndrew, of Knox College in Galesburg, Ill., and his colleagues asked 166 undergraduates to read emails with slight tweaks to their style and grammar.
The researchers also added in up to five exclamation and question marks into the text, which was about 80 words long.
Participants were then asked to rate the emotional tone of the emails and guess the writer's sex.
Writers whose emails included more errors were believed to be more apathetic.
Use of the third person along with excessive use of question marks rated high on the anger scale.
A person using many exclamation points and the first person was perceived as feminine and happy.
"The punctuation sets the tone of the message; if you write it in the first or the third person amplifies whatever that effect was," McAndrew told Live Science.