fix for email header

[owocki]

Description

changes the headers size to make it work in outlook

Refers/Fixes

#4946

Testing

tested locally

[codecov]

Codecov Report

Merging #5139 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5139      +/-   ##
==========================================
+ Coverage   30.85%   30.86%   +<.01%     
==========================================
  Files         219      219              
  Lines       17661    17656       -5     
  Branches     2435     2435              
==========================================
  Hits         5450     5450              
+ Misses      11988    11983       -5     
  Partials      223      223

Impacted Files	Coverage Δ
app/retail/views.py	29.26% <0%> (ø)	⬆️
app/marketing/views.py	11.9% <0%> (+0.15%)	⬆️

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