Free and unlimited

1 – On your WordPress admin, go to the plugin installer search for CampaignDot and install it
2 – Now it is installed, under the CampaignDot menu, choose “Company information” 
3 – Upload your company logo, fill your company detail, the social networks.
4 – Now, for each user, you can add some more details that will appear in the signature
– First name, last name
– Job description
– Profile photo
– Direct phone number
– Email address
… this will be the content of the email signature.
5 – choose the signature template,
6 – Save. Verivy the signature is fine, 
7 – Send it to the user
8 – He/she will receive the email signature and install it in his Email app – this can be Outlook, Mail, Thunderbird or Ios devices.
Check the free plugin here: