Failing to send an email with more than one attachment

[Wenzevedzemvere]

I use 'Windows Mail' to receive my Yahoo mail (UK & Ireland). My ISP is
T-Mobile/UK. My OS is VISTA; Antivirus is Norton 360.
I generally have not much problem receiving/sending mail BUT whenever I try
to send more than one attachments, my computer lasts forever showing 'sending
mail' and then fails, producing the following error report:

Your server has unexpectedly terminated the connection. Possible causes for
this include server problems, network problems, or a long period of
inactivity. Subject 'MAWB: 129-5787 8160 HAWB:1427 CNEE: PRINCE HWENJERE -
ARRIVAL MARTINAIR 19/10/2009 05:00hrs', Account: 'pop.mail.yahoo.com',
Server: 'smtp.mail.yahoo.com', Protocol: SMTP, Server Response: '421 Service
not available ; Closing transmission', Port: 465, Secure(SSL): Yes, Server
Error: 421, Error Number: 0x800CCC0F

 

[t-4-2]

How large ( in terms of KB or MB ) is your " more than one attachments " ?

t-4-2

 

[PA Bear [MS MVP]]

TIP: Disable email scanning by your anti-virus application. It provides no
additional protection and it may be causing your problem.

Why you don't need your anti-virus to scan your email
http://thundercloud.net/infoave/tutorials/email-scanning/index.htm