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I have a PHP script under a Wordpress theme sending emails using the mail() function.  I have postfix, dovecot and sendmail installed on the server.

Mails are not being sent from that script.  After a long wide search, the only lead I could find as to this error is this mail.log error I am getting from the php mail() execution:

postfix/sendmail[7588]: fatal: Recipient addresses must be specified on the command line or via the -t option

I couldn't find any info as how to deal with it.  How can I resolve this?

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Took me a few days but here's the solution:

It's in the mail section of /etc/php5/apache2/php.ini These configurations need to look like this:

[mail function]
SMTP = localhost
smtp_port = 25

; For Unix only.  You may supply arguments as well (default: "sendmail -t -i").
; http://php.net/sendmail-path
sendmail_path = /usr/sbin/sendmail -t

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