: Issues sending emails via Mandrill service. Sometimes messages disappear I've been using the Mandrill service to deliver automated emails from my web site (using their php APIs.) The service seems

@Looi9037786

At least in my case, I kept all the bureaucracy to make my chances to reach an inbox safer. From top of my mind:


Make sure you use a custom domain address (blah-blah@yourdomain.com). Using a generic, public accessible domain (think of gmail, outlook, yahoo) is not a good idea, since you can't control it, and other providers don't like (and tolerate) emails sent from massive servers (like Mandrill) that don't come signed.
Related to the previous one, make sure you enable and correctly set the DKIM and SPF rules for each domain you use. After that, test it! It's everything in the settings page of Mandrill. You'll also need to edit those rules in your own provider. This ensures other service providers know you are the owner. Otherwise, they may skip the inbox (they do it at random, there's no formula).
Test it using your emails, from different providers, if you have them. Not only they'll teach you how your emails are being seen from your clients, but you'll also be able to check how long they take to arrive your inbox, and if they arrive at all.
Check which is the domain of the clients that missed the email. If they're all the same, then you have something to ask (to that same provider).
Check the Mailchimp Blog. They give a lot of tricks.
Each client domain has different rules to accept an email. Search for the major you need.
Maybe more importantly. Ask the Mandrill team for help. They gave me a lot of hints on how to keep things working. They're really nice and willing to help, and also they're around in stackoverflow as well.

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