Swiftmailer subject and weird whitespace problem

When sending a message with swiftmailer or SmtpMailer, the subject has a weird whitespace.

The subject should look like this: "Newsletter October 2010 - Hello everyone" But looks like this: "Newsletter October 2010 - Hello everyo ne"

The whitespace always comes up the same place.

PHPmai开发者_如何学JAVAler does not have the whitespace, but we need to use swift because of spam.

Hope you can help me.

Thanks,

Troels