Jonas Vautherin via Postfix-users:
> > Indeed, RFC 5322 recommends (i.e. should) single space.
A safe change is to change the strftime() call in the Postfix
mail_date() function, so that it uses %d (day-of-month as 01-31)
instead of %e (which replaces the leading 0 with space).
This is not only a common day-of-month format in Received: headers,
it avoids re-inventing strftime(), and it keeps the string length
unchanged, which reduces risk.
Wietse
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