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SMTP requires authentication

By AnswerMan ·
Can anyone tell me why Outlook 6 in XP Home, when DSL connected to an ISP, needed to have SMTP "authenticated" but nothing regarding the "POP" side of the transaction?

I didn't install the "nifty" software that the ISP sent (it's really awful) so maybe that's it?

Interstingly, once I chose the checkbox "my outgoing mailserver requires authentication" .. all is well >??


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by Gungnir In reply to SMTP requires authenticat ...

ThePOP3 protocol is passing in your configured username & password automatically to verify you can access the incoming mail. SMTP originally did not have this provision and mail could be send by just establishing a telnet connection to the correct port. SMTP AUTH is an extension of SMTP that requires the sender to send username and password before sending.

To enable the sending of the additional step is the purpose of the "my outgoing mailserver requires authentication" checkbox. Usually this is the same username and password as the POP3 account uses, but it can be configured to a different set of creditionals.

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by ivans25aus In reply to SMTP requires authenticat ...

SMTP requires authentication when the ISP requires this. This is generally to try and combat the problem with SPAM email being circulated through potential OPEN RELAY mail servers.

More and more mail servers are now looking at ways to stop spam from being circulated through their system. This is to ensure that they are not inadvertantly black listed by spamming regulators whish ISP's utilise to block potential culprit OPEN RELAY mail servers.

I recently found that a web-based email account with POP3 access implemented this on their SMTP mail server.

Usually the authentication used will be your POP username and password that you receive your email with.

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by AnswerMan In reply to SMTP requires authenticat ...

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