SMTP on a web server

Why would you need SMTP or FTP to be running on a web server? Does it depend on the functionality of the apps/sites running on that server, can you provide some examples of when you would want FTP/SMTP to be running on a public facing web server? I have noticed it is running on some web servers and not others, so its either bad practice and the admin has forgot to disabled it, or there are legitimate reasons. these are IIS servers..
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pma111Asked:
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Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
nope, SMTP and FTP components are not compulsory to be turned on within IIS, but just the fact that these 2 components could be very useful if it's required.

Given examples

1. If the web application that is running on IIS required to send out emails, there's an option for the site admin to turn on the SMTP component in IIS, so that emails could be send out from the web application itself.

2. Similarly, we can turn on the FTP service in IIS if you wish to use it as the FTP server so that the local files can be transferred to server end.

of course, there's no necessity to turn on both SMTP and FTP components in IIS as there's tons of alternatives solutions/components available than the built-in features in IIS. But to send out emails, the respective SMTP port must be openend, similarly for FTP as well.

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Dave BaldwinFixer of ProblemsCommented:
On shared hosting, users need FTP to upload their files for their web sites.  A simple SMTP server is good for sending emails from the web sites.

If you have local LAN access, you may not need FTP.  And local email is often provided thru a dedicated email server.

It just depends on what the needs are.
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Microsoft IIS Web Server

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