Oxmail aims to provide a reliable mail relay service. No messages
are discarded or filtered.
There are three possible outcomes for each message presented.
- As much checking as is practical is performed prior to
acceptance of a message to maximise the chance of delivery. For mail
from outside Oxford, the recipient address is checked with the
downstream MTA. The sender address is verified in order to help
ensure that in the event of non-delivery after acceptance that an
error message can be sent to the sender.
- Pre-acceptance checking tries to ensure that all accepted
messages are deliverable. Any message that cannot be immediately
delivered is queued and further delivery attempts are made from time
to time. The retry interval starts small and increases with time. A
message will be queued for 7 days before being returned to the
- Rejection occurs at SMTP time. The sending MTA is responsible
for informing the sender of this.
Up: Contents Next: 2. Junk Mail