I've followed this guide to setup an email server with IMAP and SMTP. IMAP is working great, but SMTP doesn't work.

If I try to send a message using telnet:

MAIL FROM: <tom@xxxxxxxx.com>
250 2.1.0 Ok
RCPT TO: <a@example.com>
554 5.7.1 <a@example.com>: Relay access denied

Attempting to login with my mail client (Mail.app on OS X Lion) gives this error in the system log:

postfix/smtpd[13322]: warning: my.computer.hostname[]: SASL PLAIN authentication failed: no mechanism available

The client says "The server rejected the password given."

What can I do to get email relaying working?


The issue was related to this bug. Following the temporary solution steps (downgrading temporarily) provided a fix. Hopefully the bug will be fixed soon and I'll be able to upgrade.

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