There are several ways to transfer your current Comcast email folders and stored messages from your Comcast account to an alternate email account. The method you choose depends upon the service you are using for your alternate email account. If you want to transfer the email messages from your Comcast account to a Gmail account, for example, you can use Gmail's "Import Mail and Contacts" tool. Many Internet service providers (ISPs), including Comcast, partner with the Esaya Inc.'s TrueSwitch service to offer its customers an easy way to transfer information from one email account to another.
Using the TrueSwitch Transfer Tool
Go to the "Generic" secure transfer Web page on the TrueSwitch website.
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Review the "Terms of Service Agreement." Then check the box next to the statement indicating that you accept the terms of the agreement.
Open the "Select a Provider" drop-down menu in the "Source Account" section. Select "Comcast." Enter your Comcast username in the "Source Account" box. Your username is the name that proceeds the "@" symbol in your email address. For instance, if your Comcast email address is Example@Comcast.net, your Comcast username is "Example." Type your Comcast account password in the "Password" box.
Open the "Select a Provider" drop-down menu in the "Target Account" section. Select the service provider for your alternate email account. For example, "Windows Live," "Yahoo," "AOL," "Verizon" or something else. Fill in your username and password for this account in the appropriate boxes. Click "Continue."
Put a check mark in the box next to "Copy my email history" to transfer your Comcast folders and saved email messages to the new account. At this prompt, you can also elect to transfer your Comcast address book to the new account, send out a notification email to everyone in your address book informing them of your new email address and arrange to have newly received messages forwarded from your Comcast account to your new account.
Click "Continue" to complete the transfer. It can take up to 24 hours for the transfer to be complete.
Using Gmail’s Import Mail Tool
Log in to your Gmail account.
Click the sprocket icon in the top-right corner of the window to open the Settings menu. Select "Mail setting."
Click "Accounts and Import." Select "Import mail and contacts."
Type your complete Comcast email address at the "Sign into your other email account" prompt. Click "Continue." Enter your Comcast account password. Click "Continue."
Follow the remaining prompts to transfer your Comcast folder and stored messages to your Gmail account.