Digitally sign campaign mail using GnuPG

Hi, I would like to digitally sign all of the outgoing mail from my business, so my customers can rest assured that my communications are authentic, as well as to raise awareness of the digital signature feature of E-mail.

I am already using DKIM signatures but that is not enough because phishers can get around that.

Is this possible with phpList? I have not found any instructions on how to implement this, if so. If not, can it be added?

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