Header too Large Error

From Roaring Penguin
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To fix this you can increase the maximum size.

1. Edit the file /etc/mail/sendmail.mc and make changes here ONLY.

2. In the section containing the define('conf... lines add the line

  define(`confMAX_HEADERS_LENGTH', 262144)dnl

3. Then create the actual Sendmail configuration file

  make -C /etc/mail

4. Load the changes into Sendmail:

  /etc/init.d/sendmail reload