PHP Sendmail Arguments Linux

Question

/usr/sbin/sendmail -t -i

I know the -t argument tells Apache that email can be sent through php.

What does the -i argument do? And are there any more arguments worth knowing about?

One other I know of is -f myemail@example.com which is a sendmail from override.

Answer 1

   -i        This  option,  which  has  the  same  effect  as  -oi, specifies that a dot on a line by itself should not terminate an incoming,
             non-SMTP message. I can find no documentation for this option in Solaris 2.4 Sendmail, but the mailx command in Solaris 2.4  uses
             it. See also -ti.

Answer 2

Here`sa Complete Guide list of commands if you wanna go deep through sendmail commands.

COMPLETE LIST OF UNIX System Manager's Manual(SENDMAIL)

* As for your question : *

 -i          Ignore dots alone on lines by themselves in incoming mes-
                 sages.  This should be set if you are reading data from a
                 file.

Simple sample sending of mail

    **<input>**
    # /usr/lib/sendmail -t - F 'Webmaster' -f 'webmaster@email.com'

    **<output**
    From: webmaster@email.com
    To: user@someemail.com
    Subject: Feedback Form 
    Hello World !