You can have up to 6 additional email accounts in Comcast besides your primary account. Sign on to your primary account and click on the Users & Settings tab at the top of the page. You should see a link in blue underneath your user name that says Create Secondary User.
Some tomato plant leaves yellow due to a lack of sunlight on mature plants. When the plants become large, bushy, and heavy with fruit, the top portions of the plant can block the lower portions from getting sunlight. This can cause the leaves to yellow, and is really nothing to worry about.
Bacterial spots and blight are two of the most common issues that can cause brown spots on a tomato plant's leaves. Particular details of the brown spot can help you identify the cause of the spotting so you can determine how to stop it from spreading.