Whenever an address is tokenized, it is stored in a single
buffer, one token following the next with a zero-value byte
separating them. The size of this buffer is defined by PSBUFSIZ. The
default size is defined in sendmail/conf.h as
(MAXNAME + MAXATOM).
In general, this definition should never be changed. If you start
getting warning messages such as:
Address too long
look elsewhere (such as rule sets) for the cause. You should consider
changing the size of PSBUFSIZ only as a last resort, and then do so
with extreme care.