On 10/04/2014 14:58, Marcin Szymonik wrote:
Hello,
We run a free accounts mail server (like gmail) and we struggle with
the outgoing spam problem.
Spammers abuse our service by creating accounts and then sending out
spam.
It is very easy and free to create an account and we want it to stay
As accounts are free and you can easily create tens of them, per account
limits don't solve the problem.
Most free mail service providers allow their users to send through SMTP and
we would prefer to do that as well.
Content based filtering may be the way to go indeed - thank you for pointing
it.
On 10 Apr 2014, at 07:58 , Marcin Szymonik szymoni...@gmail.com wrote:
Hello,
We run a free accounts mail server (like gmail) and we struggle with the
outgoing spam problem.
Spammers abuse our service by creating accounts and then sending out spam.
It is very easy and free to create an
A few things you can do:
1. Many spammers can switch their IP address but you should blacklist any ip
that signs up for an account and spam, it will slow them down at least
2. The 100 cap per day is a good idea but I'd lower it to 5 messages a day,
increasing by a couple messages cap per week.
Limit the number of destinations (recipients) allowed in an e-mail.
Limit the number of e-mails per minute or half minute or whatever
frequency you observe as their pattern.
Put in a SPAM filter on outgoing mail and drop SPAM.
Block repeated violations from from 1 IP.
Just lock them out for a
