The solution was a simple -f (see it in the extra headers just before the last sam@xxxxxxxx). Sets the envelope sender address when using sendmail with the -f sendmail option. mail("robin.vask@xxxxxxxxxxx, sam@xxxxxxxxxxxxxx", "Testing the simple mail functions", "Did you get this one?", "From: sam@xxxxxxxx \n", "-fsam@xxxxxxxx"); > I believe the problem is that Verizon checks the MAIL FROM address > during the SMTP session against the domain portion of the From > header. If they don't match, the mail is rejected (or dropped). This > was an issue for a webboard I use... -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php