Comments for

Comment from Gomoco on 2011-07-22

2011-07-22T12:30:58Z

sweet and straight to the point, i'm sure to be visiting this often

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Comment from Peter Malaysia on 2011-02-11

2011-02-11T17:31:01Z

Thanks for the clear explanation. As it says, "A picture tells a thousand words". I've already had this problem for a few days, checked numerous websites for solutions, talked to Microsoft staff (they wanted 90 Malaysian ringgit from me...of course I did not accept it), talked to my ISP provider staff, checked a few more websites, and finally hit the jackpot. Your clear explanation finally made sense and....presto! Problem solved. Thanks.

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Comment from George on 2011-01-05

2011-01-06T03:38:00Z

This is a good explanation. But, the problem is VERY inconvenient. It happens all too often for me. I think the ISP should take extra steps to make sure their customers do not have to go through this problem. I let my ISP know often when this error occurs.

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Comment from CISO on 2010-09-28

2010-09-28T22:13:38Z

See the comments at :

http://ask-leo.com/what_is_pop_or_pop3_or_a_pop_account_and_what_about_smtp.html

might give you more info about how to prevent unwanted Relay

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Comment from David on 2009-10-19

2009-10-19T07:44:53Z

Hello Leo!
I really find Good and helping answers from you everytime I visit your site. Especially the "relaying denied" The explanation is weel done that even a blind person can understand. Thks

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Comment from Viggo on 2009-10-13

2009-10-13T20:55:46Z

Hello Leo!
Thks for a very good explanation about what really happens when sending an e-mail. An image is worth a thousand words - once again proved to be true.
Wonderful work!
Viggo.

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Comment from Jeff in Tampa on 2009-10-13

2009-10-13T17:14:29Z

Leo, there's actually another step early in the authentication process that can cause this error, and it's one often encountered by business traveleres like me. My e-mail is provided by RoadRunner, and when I'm home, I'm physically connected to the RoadRunner network domain and everything is fine. When I travel, however, I'm connected to either a hotel's or client's network, or in some cases a public (wireless) network.

So, the first thing the RoadRunner servers do is to authenticate the server I'm physically connected to. The RoadRunner servers will start by determining if they will "trust" the server I'm connected to; that can fail if the server I'm on doesn't meet the minimum level of security protocols (this is usually a maintenance issue with a hotel's network). (The figures above could be updated to add this "connection domain" server between your computer and the SMTP server.)

Sometimes I can work around this by changing my outbound settings to "log on to inbound server before sending mail". If that doesn't work, I contact the hotel network provider's support number and ask for the IP address of their SMTP server. (If you do change the SMTP server while on the road, set an outlook reminder to change it back when you get home.)

This solves the first half of the authentication problem (denial by your usual SMTP server), though your recipient's servers may still deny relaying from the hotel's SMTP server. In that case, there's always your ISPs web mail option (BCC yourself to get a copy to save in Sent Mail).

Finally, if you consistently have problems with one hotel's (or hotel chain's) network, bug them to keep their servers up to date!

div class="leocomment">There's another hotel related scenario as well: Why can't I send mail from my hotel room?

14-Oct-2009

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Comment from Dr. Raphael Eban on 2009-10-13

2009-10-13T17:07:43Z

I loved your first diagram and laughed as it came up. 'magic happens' [like Rumsfeld's 'stuff happens'] describes so much of what hasppens in life, not just in computing.Much of medical pratice and therapy is covered by 'magic happens'.

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