As you noted in your post, when it comes to email there is a very thin line between informative, helpful emails and annoying promotion messages. In the case you outlined, I would say go for it as long as you clearly mark an unsubscribe link and where the email came from. For instance, "This email was sent to [email protected] since you're a registered user of FACEBOOK_APP. If you want to change your notification settings or unsubscribe, click here."
As for success, I'd use SendGrid/another outsourced mail provider. Mail sent using AppEngine's mail facility seems to get marked as spam at higher rates than other services. Obviously there is no way to guarantee that all mail is delivered, but you can configure appropriate SPF records and so forth to encourage mail servers to trust you. You can also use services such as http://www.mail-tester.com/ and http://isnotspam.com/ to make sure your emails don't "look" spammy to filters. ----------------- -Vinny P Technology & Media Consultant Chicago, IL App Engine Code Samples: http://www.learntogoogleit.com On Fri, May 15, 2015 at 2:32 AM, Kaan Soral <[email protected]> wrote: > Hi everyone > > Over the years, I collected emails from facebook app users, I intended to > use email as a part of app logic, but I never did, so I've never emailed > anyone > > Now I'm wondering whether it would be technically possible and generally > appropriate to email users announcing a new product > > My first concern is the general appropriateness, I will explain in the > email that this is a one time thing and the source of the email > My second concern is spam filters, I'm concerned that after a couple > thousand emails, all of the emails could be marked as spam by filters > > I would really appreciate some advice > (I'm either going to use appengine/aws's email service, ease email > sending, increase the volume over time, or use a service like sendgrid, the > success is the main concern) > > Thanks, > Kaan > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/google-appengine. > To view this discussion on the web visit > https://groups.google.com/d/msgid/google-appengine/4c5bc3af-074c-4104-8ab7-2b924f91e7bb%40googlegroups.com > <https://groups.google.com/d/msgid/google-appengine/4c5bc3af-074c-4104-8ab7-2b924f91e7bb%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/CALSvALA%3Dje1%3DThkqwLfU4QQTnOx88pk1LHVGToEutA0wmwf%3D2Q%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
