Problem with Email Configuration and Contact Form cannot be sent

[mayya]

I'm struggling with email setup and contact form (ver.1.4)

1. I set contact email with SMTP using SMTP server, user, password provided by free hosting but e-mail test failed all the times.

2. Also when I tried sending message through Contact Form, it turned to white page and text;

Fatal error: Class 'Swift_Message_Attachment' not found in /home/............./public_html/tools/swift/Swift/Message/EmbeddedFile.php on line 20

I didn't attach any file but above message came up.

What I guess is I did something wrong with SMTP setup. Following are what the hosting gave me.

POP3 Host Address: mail.xxxxxxxxx.com
SMTP Host Address: mail.xxxxxxxxx.com

Mail Server Username: contact+xxxxxxxxx.com
Incoming Mail Server: mail.xxxxxxxxx.com
Incoming Mail Server: (SSL) eu1.freehosting.com
Outgoing Mail Server: mail.xxxxxxxxx.com (server requires authentication) port 25
Outgoing Mail Server: (SSL) eu1.freehosting.com (server requires authentication) port 465
Supported Incoming Mail Protocols: POP3, POP3S (SSL/TLS), IMAP, IMAPS (SSL/TLS)
Supported Outgoing Mail Protocols: SMTP, SMTPS (SSL/TLS)

Currently i used SMTP ; mail.xxxxxxxxx.com, Port 25, SSL
Even I have been trying to switch above stuff, still it didn't work.

Can anyone help me solving these problems. I'm not familiar with codes or scripts at all.