Bug: Email can be longer than 50 characters

[jeronkk]

Description

Based on RFC 5321 – Section 4.5.3.1.3, email length can be a total of up to 254 characters (excluding 2 characters <> in SMTP envelope).

Part	Max Length
Local Part	64 chars
@ Symbol	1 char
Domain Part	189 chars
Total	254 chars max

Steps to reproduce

1. Enter the below command.

add n/Bernice Tan p/98765432 e/bernice_tan_1234567889_long_email_test_123456789@company.org j/Data Analyst s/Screening a/456 Bukit Timah Rd

2. The error message Email cannot exceed 50 characters. will show.