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1) , MX " " (, 50, gmail 20), gmail . , , MX, SMTP- , , . , sendmail, , . , , - , gmail.
2) I see no reason why not. If you never allow sending emails to your outgoing servers and you perform low priority, it should work fine.
Also, be sure to turn on all servers that can send mail in your SPF text entry. The spam filter should check and trust that at least as many MX records as not all companies use the same inbound server for outbound ones.
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