Chris wrote:
Edward Diener wrote:
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 ?

No, it only affects the script it's running in. Comment it out.

Check your mail server logs and/or apache/php logs to see if anything is going there.

You are correct. The mail server logs showed that a number of outgoing e-mails had been blocked because of an error. Once the outgoing e-mails were released I received my e-mail.

It also turns out that the was added to the header as the Reply-To address, not as a primary From address. I should have looked at this myself rather than taken the comment of someone else.

I am still trying to investigate why AT&T e-mails are not being received but it may have to do with the outgoing mail server and is being investigated by my employer. I will wait on any further script changes until he tells me what is happening with the outgoing mail server.

Thanks very much for your help.

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