Why there's an error when sending e-mail to Eset?

I am using Outlook Express and I was trying to send out a suspisious file that only VBA32 detected it heuristically.

The message could not be sent because its size exceeded the server's limit. You can use the option, located in Tools | Accounts | Properties | Advanced, to break messages into smaller parts. Subject 'Suspected homemade virus/trojan/keylogger', Account: 'CyberMew', Server: 'smtp.gmail.com', Protocol: SMTP, Server Response: '552 5.7.0 Illegal Attachment d16sm1986475wra', Port: 465, Secure(SSL): Yes, Server Error: 552, Error Number: 0x800CCC6D

This is a report processed by VirusTotal on 08/17/2005 at 11:56:50 (CET) after scanning the file "ionduper04b.zip" file.
Antivirus Version Update Result
VBA32 3.10.4 08.16.2005 suspected of Trojan.Win32.FakeMSN.1
(The rest none detected)

And this is from Jotti
VBA32 Found I-Worm.Psw-protected (probable variant)

The size of file is around 2.01MB.

 

You can only send .jpg and .gif files with Gmail...

Rename it to Something.zip.jpg and it will work

 

And rar,ace files too + movies

 

Ah I see. How about the file limits/extensions which they receieve? Are there any limits like 50MB max?