By default postfix limits the attachment size to about 10 MB. You can determine the current limit with the following command: # sudo postconf | grep message_size_limit message_size_limit = 10240000 To increase the limit add (or change) the following setting in the file /etc/postfix/main.cf: # 20MB message_size_limit = 20480000 After restarting the postfix service the […]