Microsoft Outlook Express Error message

[Mustang]

Anyone come across the following MS Outlook error message: -

"The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was xxx. Relaying not allowed - please use SMTP AUTH', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79"

Tried google and not got much back.....

[Toad]

Is your email server hosted by your current ISP ?

[DaveB]

From memory it's cause your mail client is trying to use SSL and the server recieving it it is not configured for it.

Try turning off the secure connection options in Outlook. Should be under Tools->Accounts->properties->advanced.

Not sure if thats still a valid solution if your using the latest version of Outlook.

[NoddY]

Either

1. (as Toad mentioned) you are trying to relay (send) the message from a foreign network/ISP [a network/ISP that is different from the one the SMTP server is located on]

or

2. Your ISP has recently introduced authentication for outbound mail. Try altering your settings to allow SMTP authenitcation (probably same credentials as your POP3/IMAP4 server) or enable POP before SMTP authentication.

Error 5** is a permanent error and requires a resend from Outlook.
Try with and without SSL/TLS.

[expat]

Either

1. (as Toad mentioned) you are trying to relay (send) the message from a foreign network/ISP [a network/ISP that is different from the one the SMTP server is located on]

or

2. Your ISP has recently introduced authentication for outbound mail. Try altering your settings to allow SMTP authenitcation (probably same credentials as your POP3/IMAP4 server) or enable POP before SMTP authentication.

Error 5** is a permanent error and requires a resend from Outlook.
Try with and without SSL/TLS.

And if you haven't, try receiving just before you send.

[Mustang]

My email is hosted by a different ISP to the one I use for internet access. However I have been successfully receiving emails until monday. I currently dont have SSL selected so I will try selecting it and see what happens.

Thanks (for now) - I may be back for more info if it doesnt work!

[ASB]

Another reason for this erro is if you cloak your address. Some receiving servers will reject it.

I use me@myco as the addrees sending through my ISP SMTP server. A few get bounced with the error you describe. me@myisp will work though.

Of course if you can't send any mail then this ain't the problem.