Making email easier

I have made great progress on my Mac to-day, but have 3 questions about emailing on OSX 10.6. after searching around without success.
1. The Mac insists that the certificate from my ISP is not trusted. I accept and it connects. I do not get that on my PC. Is there any way of killing that irritation for good?
2. Under Windows Outlook Express I set up so that EVERY outgoing addressee (origination or reply) would go to the address book automatically. I cannot find an automatic setting on my MAC. Is it available?
3. A setting on my PC ensured that every email downloaded to the PC from the ISP was deleted at the ISP. In Mac I find that the mail is still at the ISP when I go back to Windows. Is there a setting for this please?
Thanks for any ideas.
Richard

exgarymac said:

1. The Mac insists that the certificate from my ISP is not trusted. I accept and it connects. I do not get that on my PC. Is there any way of killing that irritation for good?

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I don't remember the exact wording but there should be an option to always remember the trust that you grant.

exgarymac said:

2. Under Windows Outlook Express I set up so that EVERY outgoing addressee (origination or reply) would go to the address book automatically. I cannot find an automatic setting on my MAC. Is it available?

Click to expand...

You might be able to create a rule for this but that's beyond me at the moment.

exgarymac said:

3. A setting on my PC ensured that every email downloaded to the PC from the ISP was deleted at the ISP. In Mac I find that the mail is still at the ISP when I go back to Windows. Is there a setting for this please?

Click to expand...

Its likely that your Windows email client was set up with POP and Mail is set up to use IMAP. How did you set up your email account?