/scripts/mailperm <cpanel username>
the above should fix it
here are further info on the script
Usage: mailperm <modifier> <user>
Arguments:
<user> – Optional argument to specify the scope of
the permissions checks. The specified user must
be a valid system account.
Modifier Flags:
–skiplocaldomains – This optional argument bypasses
addition of missing domains to the /etc/localdomains
file when specified. The localdomains file specifies
to Exim that it should always accept delivery for
the listed domains. Remote domains are removed from
/etc/localdomains regardless of this flag.
–skipmxcheck – This optional argument bypasses synchronizing
the mail exchanger setting from the cpanel users file to the
system.
–dirsonly – This optional flag limits setting permissions
to only modifying directories.
NOTE: The “maildirsize” files are always fixed if needed.
–skipserverperm – This optional flag prevents modification
of the mail system files used by Exim and limits the
scope of permission modifications to the mail account
files.
–verbose – This optional flag signals the utility to
report detected permissions problems per user prior
to modifying any permissions.
–help – display this message and exit.
