Mandrill Emails not reaching any mailbox, but Mandrill showing status 'Delivered'
Mandrill does not offer any support. I've sent them many tickets, but still no answer. I hope someone here will help me out.
I'm sending emails through SMTP. I'm able to send few thousand emails in start, but after few thousands, no email reaching any mailbox. Mandrill activity showing that the email is delivered, but it's not and there's no email in backlog. I have limits around 50K/hour.
I tried making another account after a day, and did some deposit too, but same thing happen with other account too. No error in SMTP client, no error in logs, nothing.
Other thing to notice is, when I hover over 'Delivered' it says "No SMTP event", but emails which are actually got delivered, showing some stats on hover over.
Answer
The Mandrill Delivered-status in the UI doesn't actually mean that it is sent, only that Mandrill have received the message for processing. This is of course extremely confusing.
The only way of seeing if an email is actually sent (i.e. successfully delivered to the receiving mail server) is to see if the message has smtp-events. Do note that it can take some time before the SMTP-events are available in the GUI/API (I have experienced a delay of between 2 minutes and 24 hours).
To see all emails that not currently confirmed delivered you can search for "NOT smtp_events.diag:250" in the search field.