Can Mac Firewall block certain emails from Gmail?

Hi all!
I use an iMac OSX 10.8.5 and I access my Gmail through Safari. (web based email).
Could someone please tell me if turning on the firewall on my iMac could block certain incoming emails?
From my understanding, enabling a firewall would NOT affect web-based emails.
Thanks in advance!!

Dont worry!
I ill try help u.
So, Firewall dont block any message, his block only not autorized access to your computer/system.The router firewall ill prevent unautorized access to you network, basic(have more restrictions in booth cases... only to explain)
If u wanna more security, or filtering, wanna ill do that in your Mail app, go do Preferences of Mail pressing Command+"," or click on Mail Menu>Preferences.Here you can modify your JunkMail and your rules.
So, about outcoming mails...your Firewall ill not block sending mais for default, but outcoming server can be changed...u can use one outcoiming server for all mails accounts.
Look that for informations about firewall:http://support.apple.com/kb/PH11309
About Rules on Mail:http://support.apple.com/kb/PH11738
JunkMail:http://support.apple.com/kb/PH4788 and http://support.apple.com/kb/HT4911
Hope helped you!If need more information just ask! =)

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