By Bryan Costales
Trustworthy, versatile, and configurable adequate to resolve the mail routing wishes of any website, sendmail has withstood the try out of time, yet has turn into no much less daunting in its complexity. Even the main skilled procedure directors have discovered it difficult to configure and hard to appreciate. For assist in unraveling its intricacies, sendmail directors have grew to become unanimously to at least one trustworthy resource - the bat e-book, or sendmail by way of Bryan Costales and the author of sendmail, Eric Allman. Now in its 3rd variation, this best-selling reference may also help you grasp the main hard model of sendmail but. the recent version of sendmail has been thoroughly revised to hide sendmail 8.12 - a model with extra positive factors and primary alterations than any earlier model of the Unix-based e mail routing software. as the most recent model of sendmail differs so considerably from previous models, a tremendous rewrite of this best-selling reference used to be known as for. The e-book starts by way of guiding you thru the development and deploy of sendmail and its better half courses, similar to holiday and makemap. those extra courses are pivotal to sendmail's day-by-day operation. subsequent, you are going to conceal the day by day management of sendmail. This part contains solely new chapters, "Performance Tuning" that can assist you make mail supply as effective as attainable, and "Handling unsolicited mail" to accommodate sendmail's wealthy anti-spam beneficial properties. the following element of the e-book tackles the sendmail configuration dossier and debugging. and eventually, the booklet wraps up with 5 appendices that offer extra element approximately sendmail than you'll ever desire. Altogether, models 8.10 via 8.12 contain dozens of latest good points, suggestions, and macros, and this enormously accelerated version completely addresses each one, and gives and increase examine sendmail model 8.13 (expected to be published in 2003). With sendmail, 3rd version in hand, it is possible for you to to configure this difficult yet beneficial software for no matter what wishes your process calls for. This a lot expected revision is key analyzing for sendmail directors.
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Additional info for Sendmail
When sendmail transports mail on a TCP/IP network, it first sends the envelope-sender's address to the other site. If the other site accepts the sender's address as legal, the local sendmail then sends the list of envelope-recipient addresses. The other site accepts or rejects each recipient address one by one. If any recipient addresses are accepted, the local sendmail sends the message (header and body together). This kind of transaction for sending email is called SMTP and is defined in RFC2821.
It can do this in two ways: by running as a program named mailq or by being run as sendmail with the -bp command-line switch. Whichever way you run it, the contents of the queue are printed. gov> Here, the output produced with the -bp switch shows that only one mail message is in the queue. If there were more, each entry would look pretty much the same as this. Each message results in at least two lines of output. The first line shows details about the message and the sender. The d8BJXvF13031 identifies this message in the queue directory /var/spool/mqueue.
Only one recipient is listed in the envelope, whereas two were listed in the message header: To: friend1, friend2@remote The remote machine should not need to know about the local user, friend1, so that bit of recipient information is excluded from the envelope. A given mail message can be sent by using many different envelopes (like the two here), but the header will be common to them all. But note that the headers of a message don't necessarily reflect the actual envelope. You witness such mismatches whenever you receive a message from a mailing list, or receive a spam message.