Sending large amounts of email notifications?

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There is a certain service. Users enter your email when you register, receive a password. In the same email they receive notification of important events for them. The amount of emails grows, soon it is expected 10-20 thousand messages a day.


The question is. How to send emails so they are almost guaranteed income and do not fall into the spam? Directly from an IP address provider does not work: the addresses in blaclisted no, but the provider network as a whole there are some gray lists, so it turns out not so good IP Reputation and writing often fall into spam or even rejected. Some paid SMTP service will advise you to send such critical messages (let me remind you with an email comes password)? There may be services provide via a VPN guaranteed white IP address? Currently we use SMTP mail.nic.ru and his work does not suit us.
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7 Answers

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And to put your smtp no desire? Or against it have any contraindications?
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Google has quite some requirements for sending, I think the rest of the approximate same
\r
\rmail.google.com/support/bin/answer.py?hl=ru&answer=81126
\r
From the existing grey sheet may not save, but even a new IP can't lose :-)
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There is nothing easier, just use postmarkapp.com
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Problem temporarily solved, even in raised SenderBase reputation :) also configured DKIM for gmail. If someone else will face a similar problem in a personal email, share the experience :)
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If you need quality SMTP service is in fact only two options: Mandrill and SendGrid.
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MailChimp
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Each ESP has its own database of IP spammers.
Primarily the problems arise when you choose to send mail to servers with IP flagged in these databases.
For example, we are only sending standard alerts - registration, password reminder, etc.
Tried different smtp and services.
Was the smtp that "loved" all known ESP. But such polls are very limited in the number of sent messages. In "rush hour" from 17 to 21 GMT 90% return with error like "too many messages".
Was services send mail with a good reputation. All ESP took the mail from him sympathetic. But usually there was one ESP that methyl mail with the IP service as "spam".
So you have to constantly monitor not only the reputation of their IP, as well as the reputation of all IP which incidentally are observed in the service of your letters on the way to ESP.
Ideally, they should not be. But to make a server send mail that will not fall into the SPAM - a great success.
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Important addition.
Continuing the proceedings found the following: one of the important factors influencing reputation - % of delivered messages. There should be no less than 95%. If more than 5% of messages getting an error like "address does not exist" - this is one of the hallmarks of spam.
The services like mailgan.com API is checking the correctness of addresses (takes a second). And, to save face, it is important to use this test e-mail addresses before you send.
I will say more - these services can send your emails through the "stained" spam IP and the selected ESP will throw your mail in spam. And the new address You will not receive until you pass the threshold of 5%. As soon as the percentage of "marriage" will be less than 5% (3-4%) - you can contact the server tech support to complain about the fact that your emails fall into spam...
Conclusion: for reliable delivery, you need to use scripts to validate user addresses. Or the reputation of your IP from the ESP may eventually fall.
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