Email marketing - spam issue
1. How exactly does a mail client like gmail, yahoo, etc decide a mail to be spam?
2. Is there specific limit to "links", certain keywords etc which trigger it.
3. if some people report a mail to be spam, does it trigger automatic action to further mails, similar to what akismet plugin does in wordpress blogs.
4. Will the addition of unsubscribe option in the mail, make any difference.
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