Port 25 & Port 110 - Are they totally different?

Hi Guys,
I am switching my ISP soon and I am thinking of using O2 Broadband (a UK company). Everything seems really cool apart from one thing. They block port 25. I thought this would be a deal breaker as I use my own domain name to send emails (for example - [email protected]) from my home ran business. I checked out my Mail settings and currently I am sending and receiving e-mails without any issue on PORT 110. I checked this by opening mail preferences and clicking Accounts then Advanced and all of my accounts show as Port 110.
So here is my question and it sounds like a dumb one - if I switch over to a company that blocks port 25 will my port 110 e-mail set up still work without any issue? I know that sounds dumb as they are two totally different ports but I wanted to check for definite as I need my business e-mails to continue to work (obviously!).
Any help or advice is always welcome & thanks in advance!

In a simple world:
your mail client contacts your mail server on port 25
they have an smtp conversation which moves the outgoing message from your client to your server
your mail server contacts the recipient's mail server on port 25
they have an smtp conversation which moves your message from your server to the recipient's server
the recipient's mail client contacts the recipient's mail server on port 110
they have a POP conversation which moves your message to the recipient's mail client
It is possible (but extremely unlikely) that your present mail server is talking to you on port 110 when you send mail. Look in the Account Info tab of Preferences/Accounts, drop down the outgoing server list, select edit server list, and you can see the port usage in the advanced tab there.
You need to talk to whoever is providing your mail server.
AK
Message was edited by: Austin Kinsella1

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