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    <p>Sire, Google is your friend. In short, there is no simple answer to your question. Email delivery is not very trivial, especially since it does not depend on your programming entirely.</p> <p>99% is your host fault. If your are VPSing, or on shared hosting - you can forget about it since you are inheriting reputation of other 300 people using the same server.</p> <p>If you own your server, check your <a href="https://www.senderscore.org" rel="nofollow noreferrer">IP reputation</a> and then figure that you will need 2-3 months of flawless emailing to start getting through.</p> <p>If you have 5K to blow a month, use <a href="http://www.returnpath.net" rel="nofollow noreferrer">ReturnPath</a> OR just someone like <a href="http://www.campaignmonitor.com" rel="nofollow noreferrer">CampaignMonitor</a> or <a href="http://www.mailchimp.com" rel="nofollow noreferrer">MailChimp</a> ESPs to deliver your emails.</p> <p><strong>DEBUG:</strong> If you have root/shell access, try the following:</p> <ul> <li>"dig mx yahoo.com" from shell</li> <li>copy first or second authorized answer</li> <li>telnet (IP/domain) 25</li> <li><strong>manually</strong> emulate SMTP conversation <a href="http://postmaster.aol.com/tools/telnet.html" rel="nofollow noreferrer">like this</a></li> <li>Paste what the Yahoo mail server tells you here</li> </ul> <p>P.S. If you are getting into spam folder, congrats! Typically your mail will be dropped at SMTP level, quietly. Worse even you will get deferred SMTP errors from Yahoo : that means they throttle you because they do not have enough data on your complaint ratios.</p> <p>P.P.S. Setup DNS records to include SPF, and also push DKIM signing for your MTA. This will help greatly when you will try to prove your legitimacy.</p> <p>P.P.P.S. Use <a href="http://www.senderbase.org/" rel="nofollow noreferrer">http://www.senderbase.org/</a> to look up your IP first.</p> <p>Good luck.</p>
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