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: ISP's blocking access to 3rd party mail servers.
Some Internet providers have recently started blocking port 25 - the port that your computer is using for outgoing mail.

If this is the case with your ISP, you can use the ISP's mail server to send mails - while you can still receive mail from other mail servers (cause ingoing mail is using a different port).

This in an attempt to help prevent spamming and abuse of open proxies / relays from their dialup and broadband customers.

Some major ISPs that do this (and the address of their SMTP server) are:

ISP - SMTP server
AT&T -
Comcast / ATTBI -
Cox -
EarthLink -
Optimum Online -
Pacbell/SBC -
People PC -
Verio -
There are others - if your ISP is not on the list you may try using "" as outgoing mail server.

Unfortunately a side-effect of this practice is that it prevents users from accessing mail servers that aren't hosted by the ISP. This would be the case with our SMTP servers.

If you are getting error messages when you try sending mail which state that is not responding or not found, contact your ISP, and find out if they're blocking port 25. If they are, you can probably send outgoing mail through their outgoing mail servers.

Sometimes, however, an ISP will not allow email to be sent through their SMTP server with a different domain. In other words, you may only be able to use their SMTP server if you have your reply address set to your ISP-based email address, not your custom domain name address that you have at EchoEchoPlus.

Sometimes you can just ask the ISP to add your domain to their whitelist of acceptable domains, but some ISP's will not even do that.

In that case you need to use the webmail to send from your domain - or switch to an ISP with a more reasonable policy.

Alternative strategy: port 587
We've enabled port 587 on our mail servers so you can send mail through our servers even if the default port 25 is blocked by the IP.

If you want to use this option you should change the port for outgoing mail to 587 in your mail programs advanced settings.

Please make sure that port 587 is not being blocked by your firewall or router if it doesn't work.

Last update: 12.07.2009, 20:59
Author: EchoEcho Support

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