A comment begins with a left parenthesis and ends with a right parenthesis. Comments
can nest. The following lines illustrate a non-nested comment and a comment
nested inside another:
(this is a comment)
(text(this is a comment nested inside another)text)
Comments can be split over multiple lines by indenting:
(this is a comment
split into two lines)
?†‘
whitespace
A comment (even if nested) separates one atom from another just like a space or a
tab does. Therefore, the following produces two atoms rather than one:
Bill(postmaster)Johnson
However, comments inside quoted strings are not special, so the following produces
a single atom:
"Bill(postmaster)Johnson"
* Note that the backslash itself cannot appear within full quotation marks.
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
1126 | Chapter 25: The H (Headers) Configuration Command
Parentheses can exist inside of comments only if they are escaped with a backslash:
(The happy administrator ;-\))
?†‘
note
25.3.4.1 Balancing special characters
Many of the special characters that are used in the header field and in addresses
need to appear in balanced pairs. Table 25-2 shows these characters and the characters
needed to balance them. Failure to maintain balance can lead to failed mail.
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