I've the same problem. My workaround is to change the lines from

Date: `date -u +"%%a, %%d %%h %%Y %%T +0000"`"
to 
Date: `LC_TIME=C date -u +"%%a, %%d %%h %%Y %%T +0000"`

in the /etc/fail2ban/action.d/sendmail*.conf files.

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https://bugs.launchpad.net/bugs/1237443

Title:
  In Email Date-Field does not correspond to RFC2822

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