A mail processing method and apparatus, a device, a medium, a computer program product, and a computer program provided in the present disclosure, where the method includes: receiving a to-be-sent mail; obtaining, if it is identified that the to-be-sent mail includes an instant messaging group identifier, a group mail address corresponding to the instant messaging group identifier; and taking the group mail address as a recipient address and performing a sending operation on the to-be-sent mail. In the present disclosure, in a case of receiving, by a mail server, a mail sent by a mail client, if it is identified that the recipient includes an instant messaging group name, the mail is sent to a group address corresponding to the group name, which improves functional integration of email and IM software, thereby providing richer collaborative office functions.