How to add a mailto link in Outlook signature?

Please follow bellows steps to add a mailto link in a signature in Outlook.

1. In the Mail view, please click Home > New Email to create a new email.

2. In the new opening Message window, please click Insert > Signature > Signatures. See screenshot:

3. Now the Signatures and Stationery dialog box comes out. On the E-mail Signature tab please do as follows:

(1) In the Select signature to edit box, please click to select the signature you will add a mailto link;
(2) Go to the Edit signature box, place the cursor where you will insert the mailto link;
(3) Click the Hyperlink button. See screenshot:

4. Now in the Insert Hyperlink dialog box, please do as below screenshot shown:

(1) Click to highlight the E-mail Address option in the Link to section;
(2) In the Text to display box, type the text which will display as linked text in the signature;
(3) In the E-mail address box, type the email address you will make the linked text linking to;
(4) Preset the subject in the Subject box;
(5) Click the OK button.

5. Click the OK button in the Signatures and Stationery dialog box, and then close the new email without saving.

So far the mailto link has been inserted into the specified signature, and it will display as mailto link normally when the signature is inserted into emails. See screenshot:

Automatically add text,current date/time to subject or signature in Outlook

Open and edit Outlook signatures in Word

Resize blurry image in signature in Outlook

Import or insert HTML signatures in Outlook