When trying to send a message in Plesk 6.0.2/Horde: 2.2.4/IMP: 3.2.2

Error There was an error sending your message: unable to connect to smtp server localhost:25

Yet I see:

[admin@www admin]$ telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 xxx.com ESMTP

I played with the smtp settings in horde.php (/home/httpd/vhosts/webmail/horde/config/) But it only caused more errors when trying other methods of smtp.

Any ideas anyone?

I worked on this for a while and then it just worked. Seems like it fixed itself because I changed nothing. Great.