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Essentially, I have a server that contains many vhosts. One vhost in particular is required to send mail from the address, however the reverse DNS for that server resolves to, and various fields in the email header pertain to the server instead of the vhost.

The software involved is PHP / Apache / Sendmail / CentOS 5.5

The domain uses an email provider on a different server, so has no links to or other than by the domain name.

My concern is that this will increase the likelihood that email from this vhost is flagged as spam. Am I worrying too much about this or is this a real possibility.

Does anybody advice on how to configure a server or domain setup in this instance?

Also, can these references to be alleviated within the PHP application sending the emails at all, or is it purely a server configuration issue?


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up vote 3 down vote accepted

I'd say it's a distinct possibility. You can limit the damage by ensuring that you have as many hints as possible that your server is a legitimate sender for the domain by configuring correct DKIM and SPF records, but it won't be a panacea.

As far as removing references to in the e-mail, it's mostly a server configuration issue -- the two big ones are HELO name and and the rDNS

The really important thing to remember, though, is to not send spam. E-mail service providers hate that.

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