I also use PGP on my FT email address. My public key is here. You can also find it on key directories by either searching for my name or for 0xCF3981BA. You can add an extension like Mailvelope to your browser to use PGP more easily.
If you send me documents or tips, and prefer to do so anonymously, you can suggest the names of the people I can contact to verify the information.
I don't recommend using corporate hardware or connectivity (your work phone, for example, or the office internet connection) to contact me if you're worried about your employer knowing that we've spoken, unless you're using methods that support end-to-end encryption, like ProtonMail, PGP, or the apps below.
Even then, while the content of our messages may be visible only to me and you, it may still be possible to see who you've contacted and when. That's less the case for apps and contact methods that use random usernames, like Threema. Avoid using WhatsApp or Telegram for sensitive conversations. Use your best judgment.
A good alternative, if you only have a work computer, is to use tor browser on public wi-fi in places you don't normally go to. Be mindful of security cameras and prying eyes. Sometimes even the presence of tor can elicit suspicion, so be sure to delete the app and the download file after you've done what you had to do.
Safest and easiest option. You don't need to use your email address or phone number to message me.
You don't need to use your email or phone number to contact me. Note my username is donatopmancini.
If you'd like to send me physical documents, use the following address:
Donato Mancini c/o Lex, Financial Times
1 Friday Street
Don't write your name or address on the outside of the envelope, and don't use mail boxes near your office, home, or places you usually go to. It's a good idea to give me a heads-up through one of the contact methods listed here so I can know I should expect something.
Other ways to contact me or other Financial Times journalists securely can be found here.