Add option to validate MX record

[RohanNagar]

No description provided.

[codecov]

Codecov Report

Patch coverage: 90.00% and project coverage change: -0.14 ⚠️

Comparison is base (78b0588) 97.86% compared to head (9ea0a99) 97.73%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #125      +/-   ##
============================================
- Coverage     97.86%   97.73%   -0.14%     
- Complexity      315      319       +4     
============================================
  Files            11       12       +1     
  Lines           563      573      +10     
  Branches        152      153       +1     
============================================
+ Hits            551      560       +9     
- Partials         12       13       +1     

Impacted Files	Coverage Δ
...n/java/com/sanctionco/jmail/dns/DNSLookupUtil.java	85.71% <85.71%> (ø)
...main/java/com/sanctionco/jmail/EmailValidator.java	100.00% <100.00%> (ø)
...ain/java/com/sanctionco/jmail/ValidationRules.java	100.00% <100.00%> (ø)

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