How do I remove maximum limit size for email?
I have successfully set up an email server using this tutorial: [How To Configure a Mail Server Using Postfix, Dovecot, MySQL, and SpamAssasin](https://www.digitalocean.com/community/tutorials/how-to-configure-a-mail-server-using-postfix-dovecot-mysql-and-spamassasin) but there appears to be some sort of limit to the size of email attachments I can send or receive. It means I have to resize photographs before sending them and my correspondents cannot understand why they cannot send me pictures either. I need this communication for my work.
Can anybody please tell me where to find where such limits are set among the huge plethora of configuration files in this set up? I have been steadily ploughing through them but it is taking far too long and there are still far to many left to plough through.
I believe it is the server, not the client. But just in case it helps, the client is Thunderbird.