asp.net - Sending Thousands of Email per day without being spam -

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i'm having website developed asp.net online art competition people can register , enroll competition.

in system there lot of emails sends on various stages of process user.

as example, 1 user gets:

  1. account confirmation email
  2. welcome email
  3. competition instruction email
  4. password reset email
  5. payment confirmation email
  6. thank email completing enrollment process.

likewise need send various emails, number of users registering per day getting higher , higher.

so lets there more 2000 - 5000. there more 10000 email sending noreply@mydomain.com email im using send emails.

anyway 1 email message send 1 user. meaning there 1 user email address in 'to:' field , no 'cc:','bcc:' fields.

my question is considered spamming ? have doubt email can marked spam. how can avoid this? there way properly?

at least separate emails registered users registration/verification emails. send them different ip addresses.

make sure recipients want receive emails , can easily opt-out @ moment (after initial opt-in) without log in service.


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