Definition:
"Mail out" is a verb phrase that means to send something (like a letter, package, or catalog) through the postal service or mail system to people or a specific group.
In a business setting, you might say: - "We will mail out the invitations to the conference next week." This means that the invitations will be sent by mail to the people who are invited.
Mailing (noun): The act of sending something by mail.
Mailed (verb, past tense): The action of sending something by mail has already been completed.
Send off: Similar to "mail out," this means to send something via mail or another method.
Post out: Another way to say "mail out," primarily used in British English.
In summary, "mail out" is a useful verb phrase that you can use when talking about sending items through the mail. It’s especially common in business contexts, but can be used in everyday conversation too.