Reminder: empty email subjects in Snow Leopard server’s postfix

By default Snow Leopard server doesn’t allow sending emails with blank subjects.

In order to change this behaviour open:

/etc/postfix/custom_header_checks

and comment the:

/^subject: *$/ REJECT empty subject header

line by prepending a # , so it reads:

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

Restart the mail service.

5 thoughts on “Reminder: empty email subjects in Snow Leopard server’s postfix”

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Simon Powell on September 29, 2009 at 9:53 pm said:

Thank you – this is really dumb. I have setup 100s of postfix boxes on various *NIX platforms and never has this been an issue. Have spent a good few hours looking into this today. All is now good so thanks again!

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UptimeJeff on November 4, 2009 at 8:58 pm said:

Thanks… one quick search on google. Found this… applied fix.
Less than 5 minutes.

THANK YOU

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Dan on May 2, 2011 at 3:42 am said:

Awesome, this fixed it quickly. I like the behaviour of forcing our users to use a subject line, but changed it because we didn’t want clients’ emails rejected. Is there some way of rejecting empty subject lines for emails orignating from our domain only, but allowing through any other empty subject line emails?

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