Q: How do I post to my LiveJournal using email?
A: First, go to http://www.livejournal.com/manage/emailpost.bml to set at least one allowed sender address and create a PIN.
You will now be able to post by sending email to exampleusername@post.livejournal.com with the PIN in the subject or the body of the message, or exampleusername+PIN@post.livejournal.com. Replace "exampleusername" with your username, and "PIN" with your PIN. For detailed instructions, please see http://www.livejournal.com/manage/emailpost.bml?mode=help.
Edit/first revision, per gooner
Q: How do I post to my LiveJournal by email or phone?
A: To post by email, first go to http://www.livejournal.com/manage/emailpost.bml to set at least one allowed sender address and create a PIN.
You will now be able to post by sending email to exampleusername@post.livejournal.com with the PIN in the subject or the body of the message, or exampleusername+PIN@post.livejournal.com. Replace "exampleusername" with your username, and "PIN" with your PIN. For detailed instructions, please see http://www.livejournal.com/manage/emailpost.bml?mode=help.
To post by phone, first go to http://www.livejournal.com/manage/phonepost.bml to authorize a posting phone number and create a PIN.
You will now be able to post by calling one of the designated phone numbers, listed at http://www.livejournal.com/phonepost/numbers.bml. The system will record your message and create a new journal entry containing an audio file.
If your phone has email capability, you can also use it to post text entries by email, using the post-by-email interface and instructions.