My ISP does block port 25, therefore I cannot send/receive my server emails. How can I work around this?
You should be able to change the default port of SMTP though I don't know how but Googling to that effect should get you there.
send mail through your ISP account or get a mail server set up in a data center. ISPs block port 25 because of spam issues and rightfully so. Most ISPs also do not want you running servers off of their accounts. You should check your agreement for any terms relating to running servers, spam, and outbound mail from your account. Many mail servers will deny mail from servers that don't have a valid reverse lookup as well. A VPS account is plenty to handle mail and most websites. It's probably a better option for you. Unless you are a spammer. In which case - knock it off!