Virtual accounts with exim and dovecot
A few people commented on my last post asking for details about how I configured exim and dovecot to have the fake scott+canonical account and separate Maildir tree.
exim4 router configuration
The first key part of the configuration is to configure exim4 to split the local part into a user name and a suffix. This allows a local part such as “scott+canonical” to be split into the user name “scott” and the suffix “+canonical”.
This is configured by adding the following two options to the appropriate routers in your exim4.conf:
local_part_suffix = +*
local_part_suffix_optional
The first option defines the suffix; normal practice appears to be to use both “+” and “-“, but since I’d previously used “-” with qmail I opted to use “+” only so that I didn’t confuse myself during the transition.
The second option allows the suffix to be optional, so that mail to “scott” is still delivered normally.
Now mail to “scott+canonical” will be delivered to the “scott” user.
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