The the best thing is to not bother with TT email and set up a Gmail address. You will find there is no problems setting it up on your mobile.
But I know there is another member who uses Hotmail's or alternitive outgoing server address and TT's incoming to get around the problem. But you will need to set up a Hotmail account on-line. It is a workaround but I do not think there is any other way.
Incoming and outgoing mail now working on talktalk with samsung mobile genio slide. I used imap4 for incoming mail. When entering username, it needs the full email address.
For outgoing mail i set up an username and password on vodafone's 360.com website. I then set up smtp.360.com as the outgoing server with smtp port 465 with SSL set to on. If anyone has problems with their samsung email feel free to ask and i can give you detailed instructions.