Chris wrote:

Any light anyone can throw on the '' address would be
most welcome.

It is using the apache user @ your host name as the default.  Try this:

ini_set('sendmail_from', '');

I will try this but I do not understand why it should work. I have a 'From:...' entry in my headers. Why is this not being used as the primary from address and why is '' being added instead as the first from address ? In other words, I can understand if I supply no 'From:...' header entry that a default '' would be used but I do not understand why it is used even when I supply a 'From:...' header entry.

"From: " is used by your mail client to show who it's from.

the ini_set (or you can set the 5th param to the mail() function) is a return-path. If the message bounces (recipient's mailbox full, server down, whatever the reason) it gets delivered to that address. They serve different purposes.

Does ini_set actually change the php.ini file in any way ? The reason I ask is that after putting in:

ini_set('sendmail_from', '');

into a new script which I tested out against, the 'mail' function now continues to work but no e-mail is received no matter what the recipient e-mail is. Even is I go back to using my old script which does not have the 'ini_set' in it, no e-mail actually gets receoved even though 'mail' succeeds when called. So I have gone from bad to worse and the ini_set seems to have affected all calls to 'mail' in this way for PHP scripts on the server.

Can I correct but somehow stopping PHP ( or may Apache ) and restarting it again to bring back the original php.ini setting ?

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