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These email newsletter services probably send millions of emails per day.

How do they successfully do this without having their system black listed?

Don't services like otmail/gmail block emails if they reach a certain threshold from a single domain?

I'm interested in running a service that will be sending a lot of emails on behalf of other companies, so just want some tips/ideas on how they do it at such a large scale. (I might not be admining the box, but want an idea of what is involved technically)

John Gardeniers
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Blankman
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2 Answers2

9

An engineer at MailChimp has written a comprehensive document titled "Email Delivery for IT Professionals" that touches all the points that you mention, and much more. You can download the document from http://static.mailchimp.com/web/guides/email-delivery-for-it-professionals/package/email-delivery-for-it-professionals.pdf.

sentenza
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Sebastiano Pilla
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There are a variety of methods these bulk mail houses use to prevent being caught by spam systems.

  • Scrupulous SPF records
  • Correct use of DKIM
  • Inclusion of a variety of mail-header items to indicate:
    • Abuse report location
    • Unsubscribe information
    • Bulk status
  • Strong attention to language to ensure it isn't spammy

And most importantly:

  • Actively work with webmail and spam-service providers to certify themselves as perfectly legitimate mailers. The process varies with each vendor, and not all do it.

And even that isn't enough to be 100%, but it'll get most places.

sysadmin1138
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