May 2019
Intermediate to advanced
478 pages
11h 21m
English
Content preview from Hands-On Network Programming with C
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Chapter 8, Making Your Program Send Email
- What port does SMTP operate on?
SMTP does mail transmission over TCP port 25. Many providers use alternative ports for mail submission.
- How do you determine which SMTP server receives mail for a given domain?
The mail servers responsible for receiving mail for a given domain are given by MX-type DNS records.
- How do you determine which SMTP server sends mail for a given provider?
It's not possible to determine that in the general case. In any case, several servers could be responsible. Sometimes these servers will be listed under a TXT-type DNS record using SPF, but that is certainly not universal.
- Why won't an SMTP server relay mail without authentication?
Open relay SMTP servers are targeted ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.