The University's message submission service is provided by
The service can be accessed on either port 587/tcp (recommended) or 25/tcp. There are two types of access.
Details of how to set up a secure connection to Oxford are given in the setup instructions for individual email clients.
ICTC Regulations require Oxford hosts to be registered in the DNS. Those that are not are denied service.
The maximum message size accepted is 100 Mbytes.
1. Explanations of our error messages
Here is a list of error messages given by the University message submission service.
Words beginning with
$ are variables which are
substituted with applicable values in each message.
1.1. DAT-CLM: Message contains malware ($malware_name)
Message contains malware.
The name Oversized.Foo means that an archive of format Foo had too high a compression ratio (currently limited to 300:1).
Remove the malware.
1.2. HST-BAN: Sending host blacklisted
The sending host is blacklisted.
Contact us for details.
1.3. HST-PTR: Oxford host has no PTR record
The Oxford sending host has no PTR record in the DNS. This is a contravention of ICTC Regulations.
Contact your local IT staff and get your host registered.
1.4. RLY-OPN: Open relay not permitted
You are attempting to use smtp.ox.ac.uk as an open relay.
The reason for this is because you are not using a computer with an Oxford IP address and you are not authenticating yourself. You should configure your email client to use authentication.
1.5. SND-VFY: Sender domain verification failed
The sender domain is not correctly registered in the DNS. The sender address must be correct so that you can be notified of any delivery errors.
Make sure that the sender address configured in your email client is correct.
Some message submission statistics are available.