Below you find my Email addresses and XMPP (Jabber) address. You can use both to contact me. Most of the time I prefer asynchronous communication. Therefore I recommend to send an Email unless it is really time critical.
firstname.lastname@example.org, if you want to talk about Free Software and my work at FSFE.
email@example.com, if you want to talk about Nextcloud.
firstname.lastname@example.org, for everything else.
Real-Time Chat (XMPP/Jabber)
email@example.com, if it is not time critical please consider writing a Email instead.
Please notice the small but important difference between my email address and my XMPP address. Sadly I had to make this distinguish to avoid XMPP spam.