19 Electronic Mail
When we first tackled the job of updating this chapter for the third edition of this book, we thought it would be pretty easy. Not much has changed in 5 years: a couple of security patches, some new spam control features, and the obsolescence of IDA sendmail. But we were wrong.
Electronic mail was important then, but now it is absolutely essential to both business and personal communication. Many of the recent changes in sendmail respond to the scaling and flexibility issues faced by ISPs with millions of email-hungry customers. Spam has inspired additional changes and increasingly stringent enforcement of the existing rules. ...
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