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copied!<p>The simple way to fix it is <strong>don't do that!</strong> </p> <p>Unfortunately the real solution to improving email deliverability is much more involved.</p> <p><strong>SPF</strong> is "Sender Policy Framework" which basically allows an email host to explicitly specify which servers are authorized to send email <em>from</em> an address at the given domain. This is becoming increasingly common due to from address spoofing by spam and phishing attacks. If you are attempting to send <em>from</em> a user's email address with an SPF your best case these days is email in the spam with a more likely result being a big warning on the (spam flagged) email or getting silently dropped altogether. </p> <p><strong>rDNS</strong> is generally used to show a valid relationship between the ip and the domain of the email sender. (if you are sending <em>from</em> a user then you <em>don't have a valid relationship.</em>)</p> <p>Both of these things will indicate that your emails are not trustworthy because you are claiming to be sending from a particular domain when you aren't. </p> <p>Don't send "from" those users, use the <code>on-behalf-of</code> header and/or the <code>reply-to</code> header. </p> <p>That alone won't keep you out of the spam folder though. Beyond using email headers correctly, What you need to do to ensure deliverability is the following:</p> <ol> <li><p>Send <em>from</em> an address in your domain. Typically this is a non-monitored account either configured to drop all incoming messages or parse them for bounces and update your system accordingly.</p></li> <li><p>Configure SPF, DKIM and possibly Domainkeys on your email. This will increase the likelihood that your email won't be flagged as spam. </p></li> <li><p>Be <a href="http://business.ftc.gov/documents/bus61-can-spam-act-compliance-guide-business" rel="nofollow">CAN-SPAM compliant</a>. This will both improve your spam score, and by making it easy for people to opt-out, you get less "report as spam flags" which will help keep you from getting blacklisted.</p></li> <li><p>Monitor your IP address in spam blacklists as it will happen anyway. Work with individual providers to get removed. One popular place to monitor your blacklist status is <a href="http://www.mxtoolbox.com" rel="nofollow">mxtoolbox.com</a></p></li> <li><p>Be patient. Many big email hosting companies are very aggressive about spam. Often they employ a "guilt until proven innocent" approach meaning people have to take your email out of spam an unspecified number of times before you go from 'greylisted' to 'whitelisted.' Some hosts have a procedure you can follow to get whitelisted but often it's a case by case basis. </p></li> </ol> <p>The alternative is to use a relay service that manages 1-5 for you, but at a cost. Personally I have a dedicated IP solution with <a href="http://www.sendgrid.com" rel="nofollow">sendgrid.com</a> because managing email these days is a real hassle. I have no relationship with sendgrid other than being a customer. </p>

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