Archived ⇒ SMTP Mail on sub-domain doesn't work|settings are right

Ive checked my smtp mail settings, but i still get errors when i do anything that involves sending mail

Could it be that having a

"+" in my user name makes it not work?

a + is mostly marked as a "space"
try the url-code for the + which is %2B

Will do and report back!
Thanks DJMaze!
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Edit
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I got an error, I dont think it has the wrond username

language/english/contact.php

* Notice line 20: Constant _YOURNAME already defined

includes/classes/smtp.php

* Warning line 110: fsockopen(): unable to connect to mail.dantar.net:25
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I think my host might have fsockopen disabled....
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EDIT

Okay its working now! I found out that if ur host used cpanel, so your mail server might be mail.domain.dom....

if your website is on subdomain.domain.com, then the socket gets blocked..

I fixed this by using localhost for smtp server!
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I hope other people read this, it had me puzzled for a few hours

i think i heave the same plob but not shore ...

put exemple ?

thk's