I succeeded in getting this to work (using log4j to send logging messages by
smtp over ssl).
I think it's appalling that log4j doesn't do this, and it isn't mentioned
anywhere in the
documentation. I even bought the complete manual for $20, but it doesn't say
a
word about this obvious issue. So, here's how I got it working. (This one's
free,
but I'm charging $20 for subsequent posts.)
There are two ways to do this. The first way involves only setting
properties and
creating a configuration file:
set the following system property:
System.setProperty("mail.smtps.host", "<mailserver_url>");
Note that the second property uses mail.smtps.host rather than
mail.smtp.host. In the
SMTPAppender's createSession code, it will take what you set with
setSMTPHost(...) and
use it to set mail.smtp.host, but the smtps protocol provider won't look at
that, so you
need to set mail.smtps.host.
If you need to use password authentication, you need to also set:
System.setProperty("mail.smtps.auth", "true");
The reason for this is similar to above. SMTPAppender will set
mail.smtp.auth, but that
won't have an effect on the smtps Session.
You now have to tell JavaMail to use the smtps protocol. My first try at
this was to set
System.setProperty("mail.transport.protocol", "smtps");
but that doesn't work. JavaMail is still going to use smtp because of some
kooky stuff it
does to get the protocol provider. It looks like a bug in JavaMail to me,
but in any case,
it doesn't work. So here's what you have to do. Create a file named
javamail.address.map
in one of the places documented in the javadoc for javax.mail.Session. In
this file, put
the line:
rfc822=smtps
That should do it.
If you need to send both secure and insecure logging messages, it could get
tricky.
You'll have to alter that file on the fly. Or, ... you could use the second
approach:
Instead of using the javamail.address.map file, subclass SMTPAppender to get
access
to the Session object it creates. Override the createSession() method. When
you
want secure email, set the protocol in the session object by doing:
session.setProtocolForAddress("rfc822", "smtps");
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