Posted by shimmyshack on 02/14/07 13:04

On Feb 14, 7:51 am, "J.O. Aho" <u...@example.net> wrote:
> Eric Layman wrote:
> > Are there ways to prevent emails generated from mail() going into SPAM /
> > JUNK folder?
>
> Don't copy headers from a mail sent with a normal mail client.
> Have a Reply-To, From and Content-type that matches what is used in the mail.
> X-Mailer header can be used to tell it's a PHP script used.
>
> Myself I add X-Mailer-URL to tell where the sending script is located (full
> url), X-Posting-Host with the remote users IP-number and X-HTTP-UserAgent
> which tells what browser the remote user used and last X-Complaints-To which
> is the e-mail address to contact if there been some abuse or if the script
> been used by spammers (don't forget to check for header injections tries, if
> you are using a mail form).
>
> You then have to think about your Subject and how the body of the message
> looks like, these affects also spam filtering. The more HTML and links you
> have in your mail, the higher risk it's to be caught by a filter. Keep in mind
> that the host where your script is run on may be in a blacklist (this is quite
> common for dynamic-ip hosts).
>
> There are never a 100% that a mail won't be caught by a filter, but you get a
> lot of looking at the mail you got to your spam folder, if there isn't any
> extra information in the mail or it's header, then contact your mail provider
> and ask why it was filtered.
>
> --
>
> //Aho

have you investigated rDNS, it depends where you are sending from - if
it from your home server, on an ADSL or such like line and if you have
a decent ISP they will let you change the rDNS for your IP, from <ip-
in-reverse-order>.ISP.com to your FQDN for the email domain you are
seding. This allows mail server to track back and trust your domain -
because you are being up front about who you are. Otherwise it's pot
luck, with most aggressive servers simply assuming your are spam
because you mail comes from a DSL account.
If you're talking about a php script on a remote host you administer -
you will need to make sure your hosting company has a decent setup,
which will include decent DNS entries and so on.

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