I wouldn't hire nearly everyone that I know who puts their [IT] certifications in their e-mail signature.
Talked to a guy that had CCNA cert in his signature and didn't know what SFTP was.
This doesn't entirely surprise me. You don't necessarily need technical expertise to obtain most certs, and you certainly don't need to actually understand all of the material. This is only one example, but I used to work with a guy who had nearly every Microsoft cert that was out there, as well as at least one Cisco cert, and he was practically useless. He knew
about certain things, but couldn't piece things together to actually make them work.
I have a number of certs myself, though I can't even recall exactly which ones. Not once have I ever included any of them in a resume, e-mail signature, etc.