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monarch is right.
On your own system you'd could cat /etc/services as root (i'd never do that in a script), but if you've got a proper configured linux like system, certain ports are reserved for proper use, indeed smtp (mail) connects to 25, pop connects to 110 and secure mail connects to 465.
There are many many more as you probably know. But why do you want to know to how to find out what port number sendmail uses in Perl?

"We all agree on the necessity of compromise. We just can't agree on when it's necessary to compromise." - Larry Wall.

In reply to Re: How Do I find the Port Number For an Internet Service? by jbrugger
in thread How Do I find the Port Number For an Internet Service? by keiusui

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    [stevieb]: I find the M::S makefiles it generates are quite straight forward, and I usually have to add a few things (github info etc). They're about 15 lines or so give or take.
    [Corion]: I don't think the EUMM-generated Makefile is that complicated ;)
    [stevieb]: Corion++
    [jedikaiti]: RonW++ #I have so much accumulated in my memory that finding the right item at a given moment often fails
    [LanX]: corion only > 800 lines
    [stevieb]: ahhh you're talking about the actual Makefile, not the PP Makefile.PL
    [Corion]: LanX: But most of that is just setup of variables to be used later, like CC , LIB etc.
    [LanX]: yes and some builders try to avoid it

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