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:
New hosts that wish to use SMTP-Relay will
need to fill out a registration form that requires PennKey authentication.
- 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:
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In this case, there is no charge and no registration required to use smtp-relay.upenn.edu.
- 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.
Form to request SMTP-Relay
Information Systems and Computing, University of Pennsylvania