Mail comes in OK, but outgoing produces error...

As the topic title says, I get mail O.K. but when I compose a message in webmail I get this error:
Syntax error in parameters or arguments
Server replied: 501 Bad address syntax
What does that mean?
I have the mail account using the same mail server as the incomming: mail.jrpserver.co.uk
And the relay too.
Here's the log:
Jun 15 05:15:22 Server postfix/smtpd[26459]: connect from 69-163-160-16.atlsfl.adelphia.net[69.163.160.16]
Jun 15 05:15:23 Server postfix/smtpd[26459]: NOQUEUE: reject: RCPT from 69-163-160-16.atlsfl.adelphia.net[69.163.160.16]: 550 <[email protected]>: Recipient address rejected: User unknown in local recipient table; from=<[email protected]> to=<[email protected]> proto=SMTP helo=<airmail914.com>
Jun 15 05:15:24 Server postfix/smtpd[26459]: NOQUEUE: reject: RCPT from 69-163-160-16.atlsfl.adelphia.net[69.163.160.16]: 550 <[email protected]>: Recipient address rejected: User unknown in local recipient table; from=<[email protected]> to=<[email protected]> proto=SMTP helo=<airmail914.com>
Jun 15 05:15:24 Server postfix/smtpd[26459]: NOQUEUE: reject: RCPT from 69-163-160-16.atlsfl.adelphia.net[69.163.160.16]: 550 <[email protected]>: Recipient address rejected: User unknown in local recipient table; from=<[email protected]> to=<[email protected]> proto=SMTP helo=<airmail914.com>
Jun 15 05:15:25 Server postfix/smtpd[26459]: lost connection after RCPT from 69-163-160-16.atlsfl.adelphia.net[69.163.160.16]
Jun 15 05:15:25 Server postfix/smtpd[26459]: disconnect from 69-163-160-16.atlsfl.adelphia.net[69.163.160.16]
Jun 15 11:25:23 Server postfix/smtpd[28457]: connect from localhost[127.0.0.1]
Jun 15 11:25:23 Server postfix/smtpd[28457]: warning: Illegal address syntax from localhost[127.0.0.1] in MAIL command: [email protected]
Jun 15 11:25:23 Server postfix/smtpd[28457]: lost connection after MAIL from localhost[127.0.0.1]
Jun 15 11:25:23 Server postfix/smtpd[28457]: disconnect from localhost[127.0.0.1]
Jun 15 14:30:10 Server postfix/smtpd[29410]: connect from vk-195.222.36-186.bih.net.ba[195.222.36.186]
Jun 15 14:30:10 Server postfix/smtpd[29410]: NOQUEUE: reject: RCPT from vk-195.222.36-186.bih.net.ba[195.222.36.186]: 550 <[email protected]>: Recipient address rejected: User unknown in local recipient table; from=<theophgokey@com> to=<[email protected]> proto=SMTP helo=<com>
Jun 15 14:30:10 Server postfix/smtpd[29410]: lost connection after RCPT from vk-195.222.36-186.bih.net.ba[195.222.36.186]
Jun 15 14:30:10 Server postfix/smtpd[29410]: disconnect from vk-195.222.36-186.bih.net.ba[195.222.36.186]
Jun 15 15:26:07 Server postfix/postfix-script: refreshing the Postfix mail system
Jun 15 15:26:07 Server postfix/master[49]: reload configuration
Jun 15 15:29:37 Server postfix/smtpd[29918]: connect from localhost[127.0.0.1]
Jun 15 15:29:37 Server postfix/smtpd[29918]: warning: Illegal address syntax from localhost[127.0.0.1] in MAIL command: [email protected]
Jun 15 15:29:37 Server postfix/smtpd[29918]: lost connection after MAIL from localhost[127.0.0.1]
Jun 15 15:29:37 Server postfix/smtpd[29918]: disconnect from localhost[127.0.0.1]
Jun 15 15:29:54 Server postfix/smtpd[29918]: connect from localhost[127.0.0.1]
Jun 15 15:29:54 Server postfix/smtpd[29918]: warning: Illegal address syntax from localhost[127.0.0.1] in MAIL command: [email protected]
Jun 15 15:29:54 Server postfix/smtpd[29918]: lost connection after MAIL from localhost[127.0.0.1]
Jun 15 15:29:54 Server postfix/smtpd[29918]: disconnect from localhost[127.0.0.1]
Jun 15 15:35:21 Server postfix/smtpd[29979]: connect from localhost[127.0.0.1]
Jun 15 15:35:21 Server postfix/smtpd[29979]: warning: Illegal address syntax from localhost[127.0.0.1] in MAIL command: [email protected]
Jun 15 15:35:21 Server postfix/smtpd[29979]: lost connection after MAIL from localhost[127.0.0.1]
Jun 15 15:35:21 Server postfix/smtpd[29979]: disconnect from localhost[127.0.0.1]
Jun 15 15:42:04 Server postfix/postfix-script: refreshing the Postfix mail system
Jun 15 15:42:05 Server postfix/master[49]: reload configuration

Assuming that you're using squirrelmail for webmail, make sure you've got SM configured properly. In terminal, do:
cd /etc/squirrelmail/config
then
./conf.pl
Check in section 2, under domain. You might want to hard code this as your mail domain name, and see if that fixes your problem.
MacBook Pro   Mac OS X (10.4.6)  

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