You should be able send mail through your ISP's outgoing (SMTP) mail server. Most ISP's allow you to send messages regardless of the return/sender's address. So in essence you could have your return address as "Billy Gates" <Bill_Gates@microsoft.com> and still use your ISP's outgoing server to send mail. Besides the headers, your message won't get altered. You will need to reference to your ISP for this information.
how to get around port 25?
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You should be able send mail through your ISP's outgoing (SMTP) mail server. Most ISP's allow you to send messages regardless of the return/sender's address. So in essence you could have your return address as "Billy Gates" <Bill_Gates@microsoft.com> and still use your ISP's outgoing server to send mail. Besides the headers, your message won't get altered. You will need to reference to your ISP for this information.