Inquiring about the information of Tencent.com and Sohu.com shows that there are no departments and telephones for the following reasons:

1. When you sent an email, the department and telephone information were not written in your signature. You can add a signature in the settings of the mail client, including your name, department, job title and contact number.

2. Your email client has not set the display signature. Some mail clients do not display signatures by default, so you need to turn on the option of displaying signatures in the settings.

3. The format of the mail is different. Some e-mails may be in plain text format, while others are in HTML format. If you send an email in plain text format, the department and telephone information in the signature may not be displayed.