problem sending email with Madasafish

[#1]

I can't receive e-mails, just send when I am using Madasafish as my ISP.
Everything worked fine until about 4 weeks ago.
I can download emails no problem but can't send just get a 530 error message.I am using another company to host my domain and mail box.
I have raised a support ticket with Madasafish but am just going round in circles being asked to check/uncheck my 'outgoing server requires authentication box'.
I can connect via another ISP at home with the same PC and everything works fine.
My hosting company say their mail servers are all working without problems and since I can connect via another ISP I am inclined to think the problem is with Madasafish.
I have tried using the telnet command to access other mail servers on the same hosting company and again they are rejected, but work when I am connected using a different ISP.
I can send through my mail box at Madasafish without a problem.

[#2]

Hi Gmot,
From what I understand, you're saying that your incoming email with a different ISP isn't being received when you are connected to Madasafish broadband?  Is that the case?
Sorry - Little confusion, your thread title is about not being able to send, but then you start by saying you can't receive.

[#3]

Sorry got words in a twist its been a long day!
My problem is I can receive emails when connected through Madasafish, but when I try and send I get an error.
it's a smtp problem.

[#4]

Aha, okay.
Can you confirm what you have set as your SMTP server and whether or not you are using authentication?
Also, can you show me the full 530 error message?

[#5]

SMPT -  mail.xxxxxxxxxxx.co.uk
authentication is on with box checked for same settings as incoming.
I have re-typed the error message from outlook-
task'mail.xxxxxxxxxxxx.co.uk - sending' reported error (0x800CCC7C):'Your outgoing (SMTP) server requires an SSL-secured connection. On the tools menu  etc. etc. The server responded: 530 web1.nexbyte.net ESMTP MailEnable Service, Version:0-2.37-denied access at 04/08/09
Have now given up trying to get problem solved and requested a MAC code!