For example: tail -f /var/log/exim4/mainlog.
Common Errors (and How to Fix Them)
There are two common types of problems that you will encounter with your server: messages being
rejected or not delivered by Exim and login failures when connecting to Courier.
Messages Rejected by Exim
The first places to check when messages are rejected by Exim are the mainlog and rejectlog
files. Here are examples of some common errors and tips for fixing them:
Relaying Denied??”The following error indicates that the client sending the message is
not recognized as a client by Exim and that the recipient domain is not in the list of local
or relay domains:
H=sample.client [10.0.12.16] F=
rejected
RCPT : relay not permitted
NOTE
Additional addresses in
message delivery
681
Running a Mail Server 25
If the client IP address will not change frequently or is in part of a trusted range of IP
addresses, you can add them by running the following:
# dpkg-reconfigure --priority=medium exim4-config
The same command can also be used to add the recipient domain as a local or relay
domain.
Do not add client IP ranges unless you trust all of the users that can connect from those
addresses. Likewise, do not add a domain as a relay domain unless you know the owner
of the domain and have made arrangements to relay mail for them.
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