There are many synonyms for the phrase "sends letter," all of which more or less convey the same meaning. Some common alternatives include "mails a letter," "dispatches a letter," "sends a note," "sends a missive," "posts a letter," and "sends correspondence." Depending on the context and tone of the message being sent, one of these synonyms may be more appropriate than another. Additionally, certain synonyms might have slightly different connotations or implications, such as "dispatches" implying a sense of urgency or importance, or "correspondence" suggesting a more formal or professional tone. Overall, the many synonyms for "sends letter" allow writers and speakers to vary their language and communicate more effectively.