Start every Perl progrm with: use strict; use warnings; on the top of it!

to get address you can use split using ; as separator. Remember to chomp eventual newlines at the end of that input.

To check valid mail address is probably better using a dedicated module of CPAN like Email::Valid Then if you need to check the presence of 8 numbers a regex seems a valid option: see perlrequick

Again to remove part of a string use regexes as substitution as in s/found/substitution/ form.

To issue an HTTP request you can use LWP::Simple or LWP::UserAgent or other CPAN modules

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