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My ISP has always blocked port 25, and I don't even have an email address from them - but I use their SMTP server for sending all my mail.
The problem using your ISP to send the email - some email providers might hold your email to verify that it did come from the correct provider
I always use the smtp servers at my hosting provider. I use different email addresses for each of my sites. I'd be in a heap of trouble if my isp blocked port 25. The CANSPAM Act says we can't spoof our "from" addresses, so I have actual legitimate mailboxes for each of my sites.
Since time immemorial on the internet, the convention is to use your ISPs SMTP server for sending mail. You don't need to use a different SMTP server for each account, you don't need to use your hosting company's server, and you're not faking the return address if you do it this way (because it is the valid return address) so CAN-SPAM has nothing to do with it.
There is no relation between a POP3 incoming mail account provided by your ISP and their SMTP server for sending mail. Just because you don't use the former doesn't mean that you can't or shouldn't use the latter. In an ideal world, you wouldn't need to block port 25, but in reality, it helps cut down on spam.
<< Since time immemorial on the internet, the convention is to use your ISPs SMTP server for sending mail. >>
I've been on the internet since before the www, and this is a convention I did not know about.
Anyway if I just use my isp's smtp server and put different return addresses for my domains, the incoming messages to those domains will go to the correct mailbox, and I can still get them off the pop3 server. And that complies with canspam?
Looks like I have a little work to do to configure all the servers in my mail client.