command line argument allows you to run a fake SMTP session with debugging
output, in order to check what Exim is doing when it is applying policy
controls to incoming SMTP mail.
However, not everybody is sufficiently familiar with the SMTP protocol to
be able to make full use of -bh, and sometimes you just want to answer the
question "Does this address have access?" without bothering with any
utility is a 'packaged' version of
It takes two arguments, an IP address and an email address:
The utility runs a call to
with the -bh option, to test whether the given email address would be
accepted in a RCPT command in a TCP/IP connection from the host with the
given IP address.
The output of the utility is either the word 'accepted', or the SMTP error
response, for example:
550 Relay not permitted
When running this test, the utility uses "<>" as the envelope sender
address for the MAIL command, but you can change this by providing additional
options. These are passed directly to the Exim command.
For example, to specify that the test is to be run with the sender address
"firstname.lastname@example.org" you can use: