A quick and easy solution is to change the port that your email software uses to send outgoing email. We have provided port 225 for outgoing email, in case your ISP blocks the standard port 25.
Step 2: Click the Tools menu, then click E-mail Accounts.
Step 3: In the E-mail Accounts wizard, select the radio button beside View or change exisitng e-mail accounts, then click the Next button.
Step 4: Highlight your Advanced mailbox account and click the Change button.
Step 5: Click the More Settings button, which will open a new window.
Step 6: Click the Advanced tab, enter 225 (or 587 for AOL customers) in the Outgoing server (SMTP) text-box, then click OK.

Step 7: Click Next, then click Finish.
Your email will now be sent, using port 225, to your standard Fasthosts mail server. This should solve the problem of your ISP blocking outgoing email to mail servers other than their own.
Step 2: Click the Tools menu, then click Accounts.
Step 3: Highlight your Advanced mailbox account and click the Properties button, which will open a new window.
Step 4: Click the Advanced tab, enter 225 (or 587 for AOL customers) in the Outgoing server (SMTP) text-box, then click the OK button.
Step 5: Click the Close button to complete the change.
Your email will now be sent, using port 225 (or 587), to your standard Fasthosts mail server. This should solve the problem of your ISP blocking outgoing email to mail servers other than their own.