_INETSMTPMail & local SMTP Server

[autoItrules209]

Hallo Guys

I want to use _INetSmtpMail-Function in connection with a local smtp server, But now I have 2 Problems....

1st:

_INetSmtpMail ("127.0.0.1","From","mail@senderhost.com","mail@recipienthost.com","Title",$a_body)

Returns an @error 50 - Helpfile says "Cannot open SMTP session" - but I dont know how to fix this issue

currently I'm using "Free SMTP Server" - maybe someone has another, better SMTP Server which I can use locally?!

2nd:

Using _INetSmtpMail ("127.0.0.1:123","From","mail@senderhost.com","mail@recipienthost.com","Title",$a_body)

results in @error=3 (IP adress cannot be resolved) - so how can I specify a port, maybe my IP blocks port25?!

[autoItrules209]

well, I solved this changing $s_first - but now I get @error 5000 - cant close connection....

connection to receiving host works now (as my firewall reports), but because of this error no mail is delivered to the recipent....