Large Email Error

Someone emailing me got the following error message:

The strange thing is that the mailbox is not full and the email had no attachments. Any ideas on what may have caused this?

 

They are different questions. One is about how to increase the mail limit and one is asking what the problem is since I discovered that there was no apparent reason for the mail limit error.

 

What are the outputs of

Code:

postconf -n | grep message_size_limit

and

Code:

postconf -d | grep message_size_limit

?

 

Shouldn't these two be the same?

 

-d shows the default settings, whereas -n shows your actual settings. Your current message size limit is 20000000 (~20MB).