Are you using postfix as MTA? I use cluebringer suite which has a lot of functionality (spf checks, helo checks, greylist and quotas)
Quotas are fully configurable by tracking inbound and outbound trafic by ip, sasl user, etc 2017-02-16 9:44 GMT-03:00 David Jones <djo...@ena.com>: > >From: Axb <axb.li...@gmail.com> > >Sent: Thursday, February 16, 2017 4:54 AM > >To: users@spamassassin.apache.org > >Subject: Re: Filtering outbound mail > > >On 02/16/2017 11:07 AM, David Jones wrote: > >> Would it make sense for me to setup/manage my own custom > >> rules for checking the To: header or could the FreeMail plugin > >> be extended to add new rules like FREEMAIL_TO? > > >To block outbound bursts using SA is probably the most inneficient method. > > >Fai2ban is probably safer / easier to manage > >Also, look into inbound rating per sender / IP & time period. > > I have implemented rate limiting and very accurate RBL > checking on inbound mail. > > I can't do blocking with fail2ban or rate limiting on outbound > customer mail since not all of them setup a dedicated > NAT IP for their servers that send email so blocking an IP > could have multiple servers behind that NAT IP. > > Our primary customers are K12 education and libraries > which have automated software that blast out emails > to parents and patrons for school attendance, grades, > progress reports, and book overdue reports. I have > whitelisted these types of emails with a SHORTCIRCUIT > rule that is excluded from the compromised account > detection. > > I guess I will setup/maintain my own FREEMAIL_TO > rules but I thought that others would also have the > same need. Maybe not. Seemed logical to extend > the FreeMail plugin to add a few new rules. > > Dave > >
