Most job applicants cannot use works email to apply for jobs. Everyone wants to access their email via the web so they use one
If you have to use these general email accounts you may find that you've been blocked by the employer or agency mail servers.
"So what can I do about it?"
Try using the agencies own website which will use a mail form of their own, usually requiring you to enter validation text, and they should always work in the first instance. CAMCO's webpage is http://www.camcoscientific.co.uk/contact.php?id=3
Once that is received the consultant will have your email address at their disposal.
Once a CAMCO consultant emails you, you are then whitelisted and your emails will not get blocked.
In summary, if you receive an email telling you that your email was blocked, then try again using the agencies "get in touch" pages.