Just a note, If this is being done on residential broadband then good luck, its very unlikely to work.
A large number of ISPs block/filter port 25 (which is used to relay emails) to "protect against spam". Not to mention the horrific IP reputations which most email servers will just bounce. Unless the mail server is only being used for internal traffic it is very unlikely to work, there is a reason its uncommon to see self hosted emails, and the majority of people which do have their own email tends to use a relay or point their mx record at a major email provider. It is possible, for example my email is self hosted, but its a whole can of worms to open. It sounds like you are trying to host your own email server and get whatever mail.twc.com is to forward emails to it? However I am not too sure. Take care, -- Polarian GPG signature: 0770E5312238C760 Jabber/XMPP: polar...@icebound.dev
