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Sending mailing lists

I am working on an application that will allow the administrator to send regular messages to registered users (log in) on the air or based on other criteria. In any case, I am curious whether to send a separate letter to each recipient or to the BCC all of them with one message. Currently, the list of email addresses will have about 1,500 recipients, but it should scale to at least 25 thousand. No problem.

Thoughts? Am I in the range that I need to worry about being spammed?

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Yes, I had a problem with a spam list with mailing lists of this size, managing email lists for nonprofits.

One wants to take extra precautions: make sure that in your letter SPF records, write a script to send emails in batches, over time. Definitely send them one at a time, and not as BCC, since direct mail is more likely to arrive. Make it very easy to unsubscribe. Include the people who signed the email in the sent message - often people have email redirected to another account, and then try to unsubscribe from this account and get disappointed.

However, do not be surprised if you need to change your IP address at some point.

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