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那个电子邮件确实是无效的,至少这是PHP开发人员所理解的.来源提供此通知：
/* * The regex below is based on a regex by Michael Rushton. * However,IT is not identical. I changed it to only consider routeable * addresses as valid. Michael's regex considers a@b a valid address * which conflicts with section 2.3.5 of Rfc 5321 which states that: * * Only resolvable,fully-qualified domain names (FQDNs) are PErmitted * when domain names are used in SMTP. In other words,names that can * be resolved to MX RRs or address (i.e.,A or AAAA) RRs (as discussed * in Section 5) are permitted,as are CNAME RRs whose targets can be * resolved,in turn,to MX or address RRs. Local nicknames or * unqualified names MUST NOT be used.
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