According to RFC 5321 - Simple Mail Transport Protocol and RFC 5322 - Internet Message Protocol, "unextended SMTP transport provides 7-bit transfer only". In fact,

A message that is conformant with this specification is composed of characters with values in the range of 1 through 127 and interpreted as US-ASCII (ANSI.X3-4.1986) characters. For brevity, this document sometimes refers to this range of characters as simply "US-ASCII characters". Note: This document specifies that messages are made up of characters in the US-ASCII range of 1 through 127. There are other documents, specifically the MIME document series (RFC2045, RFC2046, RFC2047, RFC2049, RFC4288, RFC4289), that extend this specification to allow for values outside of that range.

To be safe, I would keep that in mind.

Hope that helps.

In reply to Re: sendmail - worried illegal chars by atcroft
in thread sendmail - worried illegal chars by hankcoder

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