rfc - Why is it so important for CR and LF to appear together in Email? -

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CR and LF are simultaneously only in the form of CRLF; They should not appear independently in the body.

is our web service which sends confirmation emails, but one of our users said that it does not follow the RFC 2822 standard, so my question is for CR and LF Why is it important to look at e-mail messages simultaneously?

Because the email has a CRF line separator. If you only use CR or use only LF If you do, you will have all kinds of unexpected problems with various clients, SMTP server combination. Some servers will reject your email, some will fix your email. Fixed emails are the most fun to deal with.