I have a list of emails about 7000 addresses. I want to send them bulk email. How to send bulk email to them directly from my blog post? Where will I find a PHP program to send bulk mail? Please suggest me.
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First off, using the mail () function that comes with PHP is not an optimal solution. It is easily marked as spammed, and you need to set up header to ensure that you are sending HTML emails correctly. As for whether the code snippet will work, it would, but I doubt you will get HTML code inside it correctly without specifying extra headers.
I'll suggest you take a look at SwiftMailer, which has HTML support, support for different mime types and SMTP authentication (which is less likely to mark your mail as spam).
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Otherwise if you want to use  the bulk mail script, that’s here
https://www.slideshare.net/bngsudheer/how-to-build-a-bulk-email-sending-application-in-php
In Last I want say php mail script is not a good idea, Because it will be marked as spam ( Some mails block this, or some delete this. Because most of the user uses the spam filter, which will automatically detects your mails and marked as spam
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