1. No default signature set: In Outlook, if the user does not set a default signature, the signature will not pop up automatically when creating a new message.
2. Incorrect e-mail format: If the user selects some e-mail formats when creating a new e-mail, such as plain text format, Outlook will not automatically add a signature.
3. Mail editor settings: Sometimes some options in Outlook mail editor settings may affect the pop-up of signatures, such as disabling HTML format or disabling the option of automatically adding signatures.
If users want the Outlook mail signature to pop up automatically, they can set it according to the following steps:
1. Open Outlook, click the file tab and select options.
2. In the options window, select the mail option;
3. In the mail tab, find the signature option and click the signature button;
4. In the "Signatures and Sites" window, select the signature type to be set and enter the signature content;
5. Check the required options in "Automatically add this signature to the message when creating a new message" and "Automatically add this signature to the message when replying/forwarding the message";
6. Click OK to save the settings.
In addition, if users need to set multiple signatures, they can also add, modify and delete signatures in the Signatures and Sites window.