317224 - Cannot send larger attachments with TB - get error Sending of message Failed due to Avast virus check

Status: RESOLVED DUPLICATE of bug 297487

(Thunderbird :: General, defect)

Description

[tom]

User-Agent:       Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)
Build Identifier: version 1.5 (20051025)

I have verified that the settings are correct and sending a file with a 620 Kb attachment works normal.

I have received a 2 Mb mpeg file.  I was trying to send it to a friend and I get the failure listed below.  I did sign on to the same web mail account, attached the same file and sent with no problem.  



Sending of message Failed.

The message could not be sent because connecting to SMTP server xxxx-xxxxxx.xx.xx.com Failed. The server may be unavailable or is refusing SMTP connections. Please verify that your SMTP server setting is correct and try again or else contact your network administrator.

Reproducible: Always

Steps to Reproduce:
1.attach a large file
2.send 
3.at 99% I get a Sending of message Failed 

Actual Results:  
TB will not send large attachments

Expected Results:  
My POP3 account has a 10Mb limit.  I should be able to send large attachments, up to the POP3 limit.

Sent the attachment

Comment 1

[David :Bienvenu]

Do you have a virus checker installed? It may be slowing down the sending of mail when it's checking for viruses. 

In any case, you can go into tools | options | advanced | general and increase the timeout value to a larger number of seconds.

Comment 2

[Ain Tohvri]

I agree with David's suggestion to check whether the cause may be the antivirus software.

I've experienced such a case with F-Secure's "Internet Security" software for home users that had firewall bundled. It simply closed port 25 for transmission according to it's timeout value despite the email was still in the sending process. There was no workaround but to disable the firewall extension. 

Comment 3

[tom]

You are correct, it was the way Avast was set up.
I made the following changes and the large attachment will now send with scanning outbound on.

First for avast:
edit the avast4.ini file in the avavast4\data folder.
In the [MailScanner] section add a line:
SendInBlockingMode=1
and save the file.
For Thunderbird timeout:
You can do this by creating (or adding to) a file called user.js in your Thunderbird profile folder.€
Add the lines:
// Increase pop3 timeout:
user_pref("mail.pop3_response_timeout", 90);

Comment 4

[Wayne Mery (:wsmwk)]

invalid per description of comment 3