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Sending mass mail

I have 'derived' newsletter system from former workers in my job. It works fine, however I have got one doubt. Sending mass emails (newsletters to customers) is splitted into chunks, 90 emails per minute. Asked why it's like this, I got the answer - because otherwise server could be added to blacklist (marked as sending spam).

Is it correct?
1 Solution
Elias SalibaCommented:
it is up to the receiver's server side how it is configured. generally most of system administrators they set it to 100. i'm sure you don't want your email not delivered because it was classified as spam. and not only on the count of emails but also on the size of the email.
i.e. where i work (2000 employees) i asked the system administrator about this issue, he said the configuration is 100 mail/min not exceeding 75KB each.

i hope this info helps.
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