[quote user="dell"] does it have aything to do with how the phpbb3 and smf sends the mail?[/quote]

Turn on session logging in MercuryC and check the result.  The error message suggests a badly formed address.

hey,

help!

i am geting this error when i use scripts like phpbb3 and smf to sendmail, but when i send mail localey it works (file>new message)

i only have smtp s server and smtp c thing.

--- Problems not related to specific addresses in the message:
555 5.5.2 Syntax error. w67sm9707498pyg.40
*** webmaster.dell@gmail.com

Your script is not talking to Mercury, turn off IIS SMTP services.

i dont have IIS smtp on...

 also, when i use the squral mail thing w/e

it works...

 does it have aything to do with how the phpbb3 and smf sends the mail?

[quote user="dell"]

i dont have IIS smtp on...

[/quote]

Your script is talking to an SMTP server, but it is not Mercury.

You either have your script pointing at the wrong address, or you have another SMTP server running. 

[quote]

 also, when i use the squral mail thing w/e

it works...

 does it have aything to do with how the phpbb3 and smf sends the mail?

[/quote]

[*-)]  I have no idea what you mean.