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ISC Networking and Telecommunications SMTP-Relay Service

ISC Networking & Telecommunications email service requires authentication for SMTP access. Certain devices which are capable of sending email are not able to authenticate and therefore need an SMTP-Relay server to accept mail. If you have such a device, please consider setting up your own SMTP-relay server. Please see our documentation on configuring Sendmail. If you cannot set up your own SMTP server, smtp-relay.upenn.edu can be used:
  1. in those cases where the envelope sender and recipient are both in domains that are hosted by ISC Networking and Telecommunications mail services. Those hosts are:
    ac.upenn.edu admissions.upenn.edu ben.dev.upenn.edu dental.upenn.edu
    design.upenn.edu dolphin.upenn.edu ehrs.upenn.edu exchange.upenn.edu
    gse.upenn.edu isc.upenn.edu mail.med.upenn.edu magpi.net
    pobox.upenn.edu sp2.upenn.edu zimbra.upenn.edu upenn.edu
    In this case, there is no charge and no registration required to use smtp-relay.upenn.edu.

  2. by hosts which have been registered. In this case unauthenticated email relaying to and from any sender and recipient connecting from the registered host is allowed. There will be a monthly charge for use of this service by registered hosts.
New hosts that wish to use SMTP-Relay will need to fill out a registration form that requires PennKey authentication.

Form to request SMTP-Relay

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