Is it necessary to wrap long lines when sending emails?
问题 I'm using Zend_Mail to send emails. Few articles (like first example on this page) have suggested to wrap long lines in message body. Questions: Is it necessary to use wordwrap(), in case any of line is larger than 70 characters? Where does this '70' figure come from? 回答1: RFC 2822 and 5322 have a sections called Line Length Limits (2.1.1): There are two limits that this specification places on the number of characters in a line. Each line of characters MUST be no more than 998 characters,