SMTP does not respond

[Rehgis]

Hello! I've just installed Avast Home Edition 4.5 and I notice that when I try to send a huge email it seems the SMTP fails (it waits for 60 seconds and does not respond). The error message appears only when I try to send big emails (with mp3 attached, for example). What is happening?
Screenshots:
http://img25.exs.cx/img25/867/smtp4hl.png
http://img25.exs.cx/img25/4356/smtp19tk.png
http://img78.exs.cx/img78/6271/smtp20vd.png
Thanks!!
 

[Lisandro]

Welcome abord!

Try to increase both timeouts (of avast into the Advanced tab of Internet Mail provider settings and of your email account, in Properties of the account, Advanced tab too). You can set both to 600, for instance. If you're on a DSL connection (not dial-up) it shouldn't be necessary a so long timeout anyway...

If this does not help, can you uncheck the Outbound mail scanning?