In an effort to keep spammers from using our outgoing (SMTP) server, we only let customers who are connected to us send email through smtp.integra.net. You can send through the Allstream server if your email is hosted with Allstream, even if your connection is hosted with another company. Please contact Allstream ISP Support at [text-blocks id=”365″ slug=”isp-support-number” plain=”1″] to help enable SMTP authentication.