Yup. look around line 1116 in smtp_in.c. Make it look like this
if (!isalnum((uschar)*s) && *s != '.' && *s != '-' && *s != '_')
On Tue, Dec 09/97, Neal Becker <neal@???> wrote:
> I guess it's the '_' character, right?
>
> 1997-12-09 13:49:44 rejected HELO: syntactically invalid argument(s): kcorp_server1.kostech.com
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GAT d- -p+(--) c++++ l++ u++ t- m--- W--- !v
b+++ e* s-/+ n-(?) h++ f+g+ w+++ y*
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