By default, the secure settings are checked. You will then recieve the following email to your primary Comcast email account. This will close port 25 to all incoming and out going traffic. shut down port 25 on your modem by sending a modified boot file to it. Email settings generally come in two forms secured and non-secured. Comcast leaves port 25 (usually SMTP) open on all its cable modems by default. Click on this section to open the screen. Also, working with shared IPs, it cannot guarantee a good deliverability for your emails (that is, a number of your messages will simply rejected by antispam filters and get lost without you even knowing). When you are on the Outgoing Server Settings screen, there is a section labeled Security Settings and Ports. In fact, a normal outbound service like Comcast’s SMTP server puts a limit to the number of people you can send the same email to (in order to deter spammers), and to the number of single emails you can send per day. There’s an important issue to be underlined, however: if you plan to do bulk email marketing, you should opt for a professional SMTP service. Then you can choose your security and authentication options: for further information please check our article about SMTP configuration.
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