Does anyone know a good tool to test whether your emails are going into spam folders?
My web app generates emails to users, and I've been getting a lot of reports back from people saying "hey, no one ever responded to my message".
I have SPF rules in place and functioning correctly (email header shows an spf pass). I've also run my message through spam assassin and it scores very low.
Any other ideas?
You should also check that your IP is not on any of major blacklists. dnsbl.info
This will at least give you an idea if you actually are getting flagged as spam.
Paul Graham canned a classic spamessay a while ago and to check smtp throughput as well with related tools spamassassin can ensure that your smtp really passed it.
There is a company that helps you with your email reputation: returnpath.net is their consulting site and the free public site is: https://www.senderscore.org/
The second site will check if you are on blacklists by IP and also give you their version of "scores" about your email reputation on the web. If you are a startup or have not sent tens of thousands of emails all over the world yet from your server you may show up as unknown on their list. If you create an account and login you can get more detailed info on your domain (and even check other similar domains.) Once you sign up they send you emails about email deliverability like an informative newsletter. You can actually learn a lot from their news letters, but they are definitely geared towards getting you to buy their services.
I'm not an employee of this company, but have met the founder and use their free service (they also have paid services that large companies like twitter.com use.)
For the past two years, we've used the service DeliveryMonitor.com. However, they've stopped accepting new applications which is a big red flag...
I'm currently evaluating the service from emailreach.com using their free trial
... We are now using DeliveryWatch.com with pertty good results thus far...