Is Mac OS X Server 10.6 (Snow Leopard) rejecting your e-mail messages which lack a subject line? Mine was, and so does the default setting on Snow Leopard Server.

Here’s a quick fix:

1) First, stop the mail service.

2 Now, you’ll want to edit the header_checks file that’s utilized by postfix.

sudo nano /etc/postfix/custom_header_checks

3) Next, you’ll see a line which says:

/^subject: *$/ REJECT empty subject header

Comment out this line by adding a pound sign (#) at the beginning of the line.

4) Once you comment out this line, it should appear as:

#/^subject: *$/ REJECT empty subject header

5) If you’re using nano or pico to edit the file, click Control+O to write the file. (Save and Exit).

6) Now, restart the Mail service and the server will no longer reject email with no subject line.

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Let me know if this solution works for you! Enjoy!