Ok so here it is:
PHPMailer from
http://phpmailer.worxware.com
1.I've put the PHPMailer files into system/library.
2.Edited system/startup.php to load the phpmailer instead of what mail script there was.
3.Then I edited the control and model relevant php scripts coz the phpmailer functions are slightly different.
There are examples of the functions in the readme of phpmailer.
Thats it pretty simple.. BTW PHPMailer lets you set the mail as html mail, so you can send more stylish mails.
I am not familiar with swiftmailer so I guess the choice is yours Daniel.
If anyone needs more info post here or PM me.