Incorrect character encoding

+1 on this issue.

Swedish and Danish characters does not work

ÅÄÖ becomes ÅÄÖ

øæ becomes øæË

I fixed the plugin, replace row ~334 in file easy-wp-smtp.php with this, it also fixes the apostrophe bug in the other thread.

/**
 * Function to test mail sending
 * @return text or errors
 */
if ( ! function_exists( 'swpsmtp_test_mail' ) ) {
	function swpsmtp_test_mail( $to_email, $subject, $message ) {
		$errors = '';

		$swpsmtp_options = get_option( 'swpsmtp_options' );

		require_once( ABSPATH . WPINC . '/class-phpmailer.php' );
		$mail = new PHPMailer();

		$from_name  = stripslashes( $swpsmtp_options['from_name_field'] );
		$from_email = sanitize_email( $swpsmtp_options['from_email_field'] ); 

		$mail->IsSMTP();

		/* If using smtp auth, set the username & password */
		if( 'yes' == $swpsmtp_options['smtp_settings']['autentication'] ){
			$mail->SMTPAuth = true;
			$mail->Username = $swpsmtp_options['smtp_settings']['username'];
			$mail->Password = $swpsmtp_options['smtp_settings']['password'];
		}

		/* Set the SMTPSecure value, if set to none, leave this blank */
		if ( $swpsmtp_options['smtp_settings']['type_encryption'] !== 'none' ) {
			$mail->SMTPSecure = $swpsmtp_options['smtp_settings']['type_encryption'];
		}

		/* Set the other options */
		$mail->Host = $swpsmtp_options['smtp_settings']['host'];
		$mail->Port = $swpsmtp_options['smtp_settings']['port'];
		$mail->SetFrom( $from_email, $from_name );
		$mail->isHTML( true );
		$mail->Subject = apply_filters('the_title', utf8_decode( $subject ) );
		$mail->MsgHTML( apply_filters('the_content', utf8_decode( $message ) ) );
		$mail->AddAddress( sanitize_email( $to_email ) );
		$mail->SMTPDebug = 0;

		/* Send mail and return result */
		if ( ! $mail->Send() )
			$errors = $mail->ErrorInfo;

		$mail->ClearAddresses();
		$mail->ClearAllRecipients();

		if ( ! empty( $errors ) ) {
			return $errors;
		}
		else{
			return 'Test mail was sent';
		}
	}
}

Hi, I have just release an update to fix this issue. Please update the plugin and see how it goes.