What happens if both the headers method and the -f method are used together for Reply-to - does the mail deliver as desired? Make sure the users table has the email of the logged in user and try $_SESSION["wa_current_user"]->email and see if it appears correctly.
The RFC2822 uses CRLF and FA's class.mail.inc uses LF only.
Article 3.6.2 in the RFC2822 states:
..... an optional reply-to field MAY also be
included, which contains the field name "Reply-To" and a
comma-separated list of one or more addresses.from = "From:" mailbox-list CRLF
sender = "Sender:" mailbox CRLF
reply-to = "Reply-To:" address-list CRLF
.....
Maybe some non compliant versions of Postfix may need the additional parameters like -f.....
Caveat - in some mail systems:
It turns out that a internet/dos style newline (\r\n) in the headers were converted to \r\r\n (ie: something mindlessly replaced all \n with \r\n without seeing if \n was already preceded by \r)
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