On Sunday, November 11, 2012 2:12:17 PM UTC-8, Andrei Sabau wrote:
>
> No longer works as it gives a "too long" error if you have too many email 
> adresses, i had 68 and couldn't use this method.
>

 The 
http://googlesystem.blogspot.com/2006/08/create-email-blacklist-in-gmail.html 
converter works fine even with a group that has over three thousand 
contacts (I tested this).

The issue is a gmail filter rule can't have more than about 1700 characters 
in it. The output of the converter is a list that looks like 
[email protected] OR [email protected] OR [email protected] OR ... The fix 
is to break that into two or more lists where each does not have more than 
1700 characters. For my own rules I break the lines down to 1500 characters 
each to be safe. The 1700 character limit is after URL encoding and the 
amount of encoding you will run into is not easy to predict unless you 
automate the process. 

Gmail does not seem to have a limit on the number of rules you can have. I 
have 145 at present with most of them having over 1400 characters. Another 
trick to save on space is rather than 
[email protected] OR [email protected] OR [email protected] OR ...
is use curly braces.
{[email protected] [email protected] [email protected] ...}
The curly braces tell gmail to default to "OR" between every word in the 
set. Thus, you end up with one space between names versus the four 
characters needed for " OR ". 

In my address book the average length of an address is 22.3 characters. Add 
one for the space and I should be able to fit 64 addresses per rule and 
will have about 1500 characters in each line.  If the OP had been using " 
OR " then 68 addresses works out to 1788 characters which overflowed 
gmail's limits.

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