So heres the situation

I am using "Mozilla Thunderbird" as my email client program.
And I want to set my site mailbox it is admin@sader.trap17.com to it
And when I am setting up this account I am asked to choose
Type of incoming server "POP" or "IMAP" also I am asked to enter Incoming server.
(I know that mailbox exist and it's working becouse I allready have few messages)

I am choosing "POP" and Incoming server name as "mail.sader.trap17.com" it looks that everything is OK but when I am entering password I get this

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I am 99.99% sure that password is correct so what I am doing wrong
Besides my SMPT is set to my internet provider

I dont get it why I am heving problem with this mailbox other mailbox works fine

So this is it hope anybody will know how to fix my problem

Make sure the log-in name is set to "admin@sader.trap17.com" and not just "admin". I made that mistake to begin with. If that fails then try replacing the @ with a +, that sometimes works.

Thank you rvalkass for your fast replay very much

I tryed like you suggest to cnahge
log-in name is set to "admin@sader.trap17.com" and not just "admin". and finaly I didn't get that ugly WARNING mesage instead I saw my messages in this mailbox

my emotion befor and until your replay
-> -> -> -> ->

P.S. never would think that problem is becouse off log-in name