On Thu, 2006-03-09 at 17:27 -0800, Angelo Zanetti wrote:
> When adding additional headers to an email that gets sent from the mail 
> function. What purpose does the X-Mailer have?
> 
It identifies the mail client. So I normally set X-Mailer = "MySite
Mailer"; or something. This directive won't normally cause problems with
servers, but the Reply-To header will. Some servers reject mail without
a valid return address, mainly because this is a spam trick. Its a
reverse lookup of sorts on the mail server side.

> Also are the following linked:
> 
> -X-Priority
> -Importance
> -X-MSMail-Priority

Yes, MSMail-Priority is for Microsoft clients, Importance is for Mac
clients (I think) and X-Priority is for the rest of the known universe
that adheres to standards. 
> 
> Another question is can I omit the Message-ID for the email? or will this 
> result in some mail servers viewing the mail 
> as spam? What criteria do I use to generate the Message-ID?
> 
Message-ID is OK to omit In my experience, but see above for Reply-To

> I've seen:
>       $headers .= "Message-ID: 
> <".date("YmdHis")."you@".$_SERVER['SERVER_NAME'].">\n";
> 
> is this ok?

I would do a date("r") for a nice RFC format date and time, but it
should be OK. 

> 
> Perhaps if someone has a link on the headers for a mail that could help me it 
> would be much appreciated.
> 

http://za2.php.net/ mail function.

--Paul

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