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Support Center » Knowledgebase » E-Mail » Problems sending emails using MochaHost's mail server (SMTP Restrictions)

Problems sending emails using MochaHost's mail server (SMTP Restrictions)

In order for customers to use the Mochahost SMTP server, they will authenticate first. Why we require this: An ISP will know who someone is when they connect to that ISPs SMTP server, because that person will be logged into the ISPs network with the username and password that was used to connect to the Internet. PORT 25 BLOCKING The most common cause of SMTP trouble is when the Internet service provider (ISP) blocks port 25, which is the port used to send e-mail. This forces a customer to use their ISPs outgoing mail server only.

The ISPs that block port 25 do this for two main reasons. The main reason is to curb people from sending spam mailings from the ISPs network using a different outgoing mail server than that of the ISP. Even though the mail is being sent through a different mail server than an ISPs, the mail header information still shows the messages as originating from the ISPs domain. For obvious reasons, an ISP doesnt want to be represented in this fashion, so they block port 25 to keep people from sending out through any outgoing server but the one belonging to the ISP. Another reason some ISPs will block port 25 is to attach an advertisement at the end of each and every email that is sent out through their server. Ever get an email from someone at At the end of the message, you'll see a message that says "Try Juno for free!" This is there as a free advertisement, and there's unfortunately, no way around it because they block port 25.

MochaHost servers allow connections to alternative port number, pot 2525 - which all customers can use exactly in the same way as the regular port 25. You can change the default SMTP from port 25 to 2525 on most of the email applications - you will need to refer to the documentation of the email client that you use for more information on how to specify different SMTP port for your outgoing email connection.

As an alternative you can alsoe use your ISPs outgoing mail server (SMTP). Your ISP can provide the settings for you to send email via their SMTP server. For example: "". After doing that, you will be sending mail though your ISP's servers rather than Mochahosts. The following ISP's are the currently known to block port 25. Juno NetZero AT&T SBC Frontier MSN EarthLink Verizon AOL MediaOne FlashNet Comcast Adelphia

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