Is Sendmail required?
Yes and no. [IMP 2.2]: There’s absolutely nothing at all forcing you to use Sendmail [http://www.sendmail.org] proper, but IMP does require a command-line program on the webserver from which it can send mail, using the same arguments that Sendmail takes. In other words, IMP cannot send mail over SMTP all by itself. [IMP 3.x]: IMP 3.x can use either a local sendmail program, or connect to a remote SMTP gateway. So if you have access to a remote SMTP gateway, then there is no need to install sendmail (or equivalent) on the webserver. If you don’t need an entire mail server on the machine on which IMP runs, you might like ssmtp [ftp://metalab.unc.edu/pub/Linux/system/mail/mta/]or nullmailer [http://em.ca/~bruceg/nullmailer/]which provides a sendmail-compatible interface, but merely takes the mail and hands it off to the SMTP server of your choice. Some mailers (like Postfix and qmail) have wrapper scripts that accept the sendmail syntax. These programs should work with IMP as long as the
