Email us at firstname.lastname@example.org
If you use another riseup.net account, it is fairly secure.
Get the secure TOX communicator.
The tox communicator is an open-source, encrypted and quite secure tool for text chats, video and voice conversations, sending files and more.
Download it from here, install and add our tox ID to your contact list.
5586448EF2FBA21FDD236B4CD397B058726BBBF8D48518D5CD099D2E4E93A12A268E051E0D81 (Amargi Thessaloniki)
Unless you got here anonymously (like via Tor), this is totally unsafe way. And it is NOT eavesdropping-secure. But it will work.