Increasing email size limit from 10Mb

Hi there,

I have a server running ISPConfig 2.2.19. Currently incoming and outgoing e-mails seem to be limited in size to 10Mb. I have tried in the past to increase this limit to 100Mb (safe enough for the traffic the server gets) but when I did, the whole server seemed to spiral out of control and crash, as you obviously have to configure spamd for this as well.

My (relevant) configuration is this:
Fedora Core 6
ISPConfig 2.2.19
Postfix 2.4.5 (SMTP)
Dovecot 1.0.3 (IMAP/POP3)
Spamassassin 3.1.9
1Gb RAM, 2Gb swap

Does anyone know the best way to do what I want?

Thanks in advance,

Neil

 

try to change message size on postfix
message_size_limit = 10485760 is eqal to 10 Mb
But i thing 100 MB is very large, you risk that your ip will be on blacklist.
I recomend size about 50 MB max, that is for one of my customer that have design center, messages above this limit i thing is for other file server service, not for mail.

 

And for PHP based webmail you probably also need:

Code:

post_max_size = 52M
upload_max_filesize = 50M
max_input_time = 600

or figures like this in your php.ini (likely in /etc/php5/).

But of course your mailer (Postfix) should also accept the larger sizes.

Paul

 

Thanks for the tips - I hadn't considered that 100Mb would be too big, but I'm sure 50Mb would be fine (50 x 1024 x 1024 = 52428800 bytes) for my application.

Is the postfix setting the only one I need to change? Do I not need to tweak spamassassin in some way to handle bigger messages, otherwise I might get a backlog?

Thanks again,

Neil

 

Thanks for your help guys, I got it working, but there's another step!

I added this to /etc/postfix/main.cf:

mailbox_size_limit = 0
message_size_limit = 52428800

The first command is necessary because first time round postfix refused to start because the default for mailbox_size_limit is slightly less than message_size_limit. I could have set the two values the same which would have worked as I'm using dovecot/imap and postfix is set to deliver each message to a separate file, but the zero value here tells postfix not to limit the size of an individuals mailbox.

Obviously tweak that setting to suit your setup!