Contact Form - Error

vienna

Following Error when using contact form plugin:
When contact recipient is set to: mail@emaildomain.net
i get following error

Error sending mail:
net) to one or more recipients

Seems the email address gets chopped up and Zenphoto
only gets net) instead of mail@emaildomain.net

I am running Zenphoto since years and it worked so far....
Maybe my host changed some settings?
Anyone who konws what happened?
Is there a way around?

Zenphoto version 1.4.5.9
PHP version: 5.5.27-1~dotdeb+7.1
MySQLi version: 5.6.24

acrylian

First this is not the current release. But regardless more info please:
Which mail handler do you use (sendmail or phpmailer)?
Is the mail address correctly entered?
Other errors in the Zenphoto and server logs?